Traceback: Traceback (most recent call last):
  File "C:\Users\edwar\AppData\Local\Programs\Python\Python312\Lib\site-packages\flask\app.py", line 1473, in wsgi_app
    response = self.full_dispatch_request()
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\edwar\AppData\Local\Programs\Python\Python312\Lib\site-packages\flask\app.py", line 882, in full_dispatch_request
    rv = self.handle_user_exception(e)
         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\edwar\AppData\Local\Programs\Python\Python312\Lib\site-packages\flask_cors\extension.py", line 178, in wrapped_function
    return cors_after_request(app.make_response(f(*args, **kwargs)))
                                                ^^^^^^^^^^^^^^^^^^
  File "C:\Users\edwar\AppData\Local\Programs\Python\Python312\Lib\site-packages\flask\app.py", line 880, in full_dispatch_request
    rv = self.dispatch_request()
         ^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\edwar\AppData\Local\Programs\Python\Python312\Lib\site-packages\flask\app.py", line 865, in dispatch_request
    return self.ensure_sync(self.view_functions[rule.endpoint])(**view_args)  # type: ignore[no-any-return]
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\edwar\OneDrive\Documents\Programming\Visual Studio 2022\PARTS_Web\app\controllers\store\supplier_purchase_order.py", line 43, in supplier_purchase_orders
    return render_template('pages/store/_supplier_purchase_orders.html', model = model, datetime = datetime)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\edwar\AppData\Local\Programs\Python\Python312\Lib\site-packages\flask\templating.py", line 150, in render_template
    return _render(app, template, context)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\edwar\AppData\Local\Programs\Python\Python312\Lib\site-packages\flask\templating.py", line 131, in _render
    rv = template.render(context)
         ^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\edwar\AppData\Local\Programs\Python\Python312\Lib\site-packages\jinja2\environment.py", line 1304, in render
    self.environment.handle_exception()
  File "C:\Users\edwar\AppData\Local\Programs\Python\Python312\Lib\site-packages\jinja2\environment.py", line 939, in handle_exception
    raise rewrite_traceback_stack(source=source)
  File "C:\Users\edwar\OneDrive\Documents\Programming\Visual Studio 2022\PARTS_Web\app\templates\pages\store\_supplier_purchase_orders.html", line 1, in top-level template code
    {% extends 'layouts/layout.html' %}
    ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\edwar\OneDrive\Documents\Programming\Visual Studio 2022\PARTS_Web\app\templates\layouts\layout.html", line 329, in top-level template code
    {% block page_body %}{% endblock %}
    ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\edwar\OneDrive\Documents\Programming\Visual Studio 2022\PARTS_Web\app\templates\pages\store\_supplier_purchase_orders.html", line 55, in block 'page_body'
    {% include 'components/store/_row_supplier_purchase_order.html' %}
    ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\edwar\OneDrive\Documents\Programming\Visual Studio 2022\PARTS_Web\app\templates\components\store\_row_supplier_purchase_order.html", line 62, in top-level template code
    {% include 'components/store/_preview_order_items.html' %}
    ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\edwar\OneDrive\Documents\Programming\Visual Studio 2022\PARTS_Web\app\templates\components\store\_preview_order_items.html", line 4, in top-level template code
    {% set str_items = model.convert_list_objects_to_preview_str(order_items) %}
    ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\edwar\OneDrive\Documents\Programming\Visual Studio 2022\PARTS_Web\app\models\model_view_base.py", line 366, in convert_list_objects_to_preview_str
    preview_str += obj_json[obj_json[Base.FLAG_NAME_ATTR_OPTION_TEXT]]
TypeError: can only concatenate str (not "NoneType") to str

Exception on /store/supplier_purchase_orders [GET]
Traceback (most recent call last):
  File "C:\Users\edwar\AppData\Local\Programs\Python\Python312\Lib\site-packages\flask\app.py", line 1473, in wsgi_app
    response = self.full_dispatch_request()
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\edwar\AppData\Local\Programs\Python\Python312\Lib\site-packages\flask\app.py", line 882, in full_dispatch_request
    rv = self.handle_user_exception(e)
         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\edwar\AppData\Local\Programs\Python\Python312\Lib\site-packages\flask_cors\extension.py", line 178, in wrapped_function
    return cors_after_request(app.make_response(f(*args, **kwargs)))
                                                ^^^^^^^^^^^^^^^^^^
  File "C:\Users\edwar\AppData\Local\Programs\Python\Python312\Lib\site-packages\flask\app.py", line 880, in full_dispatch_request
    rv = self.dispatch_request()
         ^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\edwar\AppData\Local\Programs\Python\Python312\Lib\site-packages\flask\app.py", line 865, in dispatch_request
    return self.ensure_sync(self.view_functions[rule.endpoint])(**view_args)  # type: ignore[no-any-return]
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\edwar\OneDrive\Documents\Programming\Visual Studio 2022\PARTS_Web\app\controllers\store\supplier_purchase_order.py", line 43, in supplier_purchase_orders
    return render_template('pages/store/_supplier_purchase_orders.html', model = model, datetime = datetime)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\edwar\AppData\Local\Programs\Python\Python312\Lib\site-packages\flask\templating.py", line 150, in render_template
    return _render(app, template, context)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\edwar\AppData\Local\Programs\Python\Python312\Lib\site-packages\flask\templating.py", line 131, in _render
    rv = template.render(context)
         ^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\edwar\AppData\Local\Programs\Python\Python312\Lib\site-packages\jinja2\environment.py", line 1304, in render
    self.environment.handle_exception()
  File "C:\Users\edwar\AppData\Local\Programs\Python\Python312\Lib\site-packages\jinja2\environment.py", line 939, in handle_exception
    raise rewrite_traceback_stack(source=source)
  File "C:\Users\edwar\OneDrive\Documents\Programming\Visual Studio 2022\PARTS_Web\app\templates\pages\store\_supplier_purchase_orders.html", line 1, in top-level template code
    {% extends 'layouts/layout.html' %}
    ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\edwar\OneDrive\Documents\Programming\Visual Studio 2022\PARTS_Web\app\templates\layouts\layout.html", line 329, in top-level template code
    {% block page_body %}{% endblock %}
    ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\edwar\OneDrive\Documents\Programming\Visual Studio 2022\PARTS_Web\app\templates\pages\store\_supplier_purchase_orders.html", line 55, in block 'page_body'
    {% include 'components/store/_row_supplier_purchase_order.html' %}
    ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\edwar\OneDrive\Documents\Programming\Visual Studio 2022\PARTS_Web\app\templates\components\store\_row_supplier_purchase_order.html", line 62, in top-level template code
    {% include 'components/store/_preview_order_items.html' %}
    ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\edwar\OneDrive\Documents\Programming\Visual Studio 2022\PARTS_Web\app\templates\components\store\_preview_order_items.html", line 4, in top-level template code
    {% set str_items = model.convert_list_objects_to_preview_str(order_items) %}
    ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\edwar\OneDrive\Documents\Programming\Visual Studio 2022\PARTS_Web\app\models\model_view_base.py", line 367, in convert_list_objects_to_preview_str
    preview_str += obj_json[obj_json[Base.FLAG_NAME_ATTR_OPTION_TEXT]]
TypeError: can only concatenate str (not "NoneType") to str
Server Error: 500 Internal Server Error: The server encountered an internal error and was unable to complete your request. Either the server is overloaded or there is an error in the application.