Blender Git Loki

Fix #31800: Blender crash by rendering in connection with linked groups

Seems the issue was caused by render layer node overwritng active scene
when render button is clicked. It lead t situations when job was adding
with owner of rendering scene, but modal callback was checking for render
jobs existing for current active scene. There was no such jobs so operator
used to finish at this point and free report list used by render pipeline.

Solved by storing operator owner in operator's custom data. Probably
there's nicer way to do fix this issue but currently can't think of it.