Resolve: avoiding clips without mediapoolitems

[jakubjezek001]

Changelog Description

When encountering a scenario where resolve timelineitems are not connected to any media pool items, it is possible that these items could be either an Adjustment Clip or a Fusion Composition.

Testing steps

1. add to your timeline Adjustment Clip (from effect panel)
2. open Loader and try to load anything
3. no error should happen and clip should be loaded to timeline

[jakubjezek001]

Task linked: OP-8273 Resolve: missing GetClipProperty

[BigRoy]

Can we get Resolve: in the PR title as well - as long as the multiple hosts/applications are in core that can help changelogs and/or e-mail notifications since "labels" don't usually appear there?

[BigRoy]

Asserts creation of media pool item when not found for specified files. This ensures proper handling and error messaging in such cases.

Could you include testing notes?

• When does this occur?
• Is there something the user can do about this? Like, can the error message also describe WHY it's wrong or what the user can do about it?
• As far as I'm aware when using assert you don't need to make the value after the , a AssertionError instance. If it's just a string then Python will raise that string as AssertionError automatically. Right? For example, see here
• Instead of an assert should this be LoadError?

[tokejepsen]

Address some of these questions; #92 (comment)

[jakubjezek001]

Thanks to @BigRoy there was found the reason why this error can happen. Thanks man!

[tokejepsen]

Lets address @BigRoy comments.

[tokejepsen]

Tested successfully in Resolve 18.6.

For completeness, the error in current develop is this when loading in a clip while having an adjustment clip on the timeline;

During load error happened on Product: "renderCompositingMain" Representation: "exr" Version: 1

Error message: 'NoneType' object has no attribute 'GetClipProperty'

Traceback (most recent call last):
  File "C:\Users\tokejepsen\ayon-core\client\ayon_core\tools\loader\models\actions.py", line 763, in _load_representations_by_loader
    load_with_repre_context(
  File "C:\Users\tokejepsen\ayon-core\client\ayon_core\pipeline\load\utils.py", line 323, in load_with_repre_context
    return loader.load(repre_context, name, namespace, options)
  File "C:\Users\tokejepsen\ayon-core\client\ayon_core\hosts\resolve\plugins\load\load_clip.py", line 48, in load
    timeline_item = plugin.ClipLoader(
  File "C:\Users\tokejepsen\ayon-core\client\ayon_core\hosts\resolve\api\plugin.py", line 462, in load
    timeline_item = lib.create_timeline_item(
  File "C:\Users\tokejepsen\ayon-core\client\ayon_core\hosts\resolve\api\lib.py", line 306, in create_timeline_item
    output_timeline_item = get_timeline_item(
  File "C:\Users\tokejepsen\ayon-core\client\ayon_core\hosts\resolve\api\lib.py", line 343, in get_timeline_item
    _ti_clip_property = _ti_clip.GetMediaPoolItem().GetClipProperty
AttributeError: 'NoneType' object has no attribute 'GetClipProperty'