Editor crashes opening MyCharacter BP after converting to 4.5

On a Mac, when opening a custom character blueprint from a project that has been converted to 4.5 from a previous version of the engine, the engine immediately crashes.

1. On a Mac running OSX 10.9.4 Open a third person project in UE4.5
2. Import user's custom uasset
3. Double click to open custom "MyCharacter_BP" (character blueprint)
4. Engine immediately crashes.

Fix UE-51650

UE-88880 - Public Discussion

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