d83facf6b2
During animation playback, `screen_animation_step_invoke` takes a reference to the active screen timer to use throughout its processing. However, as part of transitioning frames (during which frame change hooks are invoked) this screen timer may be removed. In the case of the mentioned report, this happens because the `frame_change_post` hook called `bpy.ops.screen.animation_cancel` which removes the timer as part of its processing. We need to recheck if our timer is still active and available after transitioning frames but before continuing. If no longer available, we should be able to return early at this point. Pull Request: https://projects.blender.org/blender/blender/pulls/147167
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