9e7e0a01b2
When the override property over a non-ID RNA pointer is not needed anymore, remove it. This case is a bit special, because the match does (potentially) detect differences within the RNA structures pointed to by the property, yet there should be no override rule for the property itself. An override rule may have been created in a previous diffing if one of the RNA pointers was null. Note that while fairly rare, this is not a corner-case, as it affects at least one (very common) RNA pointer: the 'animation_data' one. This left-over rule (created when the liboverride is animated, while the linked reference data would have no anim data, and becoming useless once both have anim data) was harmless so far, but would become a problem with up-coming changes related to #110067.
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