de5d0cfdc5
File under #138795 showed several issues, which, while investigating them, led to also fixing some other issues. - FBX files can contain non-bone nodes in between actual bone nodes ("fake bones" as they used to be called in Python importer). Handling this case was missing in the new importer. - Due to above, some armatures had what appeared like multiple "root bones" inside them, which led to crashes while importing animations. - Meshes with multiple armature modifiers (multiple skin deformers in FBX) were not handled correctly, see https://projects.blender.org/blender/blender-addons/issues/45171 for when the same issue was fixed in the Python importer. Extended test coverage to encompass the above. Pull Request: https://projects.blender.org/blender/blender/pulls/138992
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