Fix editor inspector crashing when the old object is no longer valid #94101
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This fixes a crash when the editor inspector tries to edit a new object when the old object is an invalid instance. See the stack trace below. I ran into this situation when closing the editor with a complex scene open. Since this is editor code that only runs once in awhile, it's not performance critical. I tested that this fix is correct by adding an else statement and confirmed that it reached there.