Package fails to load due to EditorOnly data when launched onto Mac or Windows

LogPlayLevel: QAGame: [2017.06.28-14.09.14:706][  0]LogLinker:Warning: Unable to load package (../../../QAGame/Content/UMG/UMG_Sprite.uasset). Package contains EditorOnly data which is not supported by the current build.

This does not affect PIE

This is a regression from 4.16.1 as it does not occur at CL 3466753

1. Open QAGame
2. Open TM-UMG map
3. Open the level blueprint
4. Change the Class on the Create Widget node to UMG_Sprite
5. Compile and Save
6. Launch onto Windows

Result: UMG_Sprite widget is not displayed

Expected: UMG_Sprite is displayed on screen

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