Fixed error in error handling
Fixed error in error handling

Summary:
During component cleanup broke the error handling :'). Causing plugin errors to bubble up and be handled as chrome errors instead. This caused our soft crash metric to spike in the last week.

Changelog: Fixed error handling of UI errors caused by plugins

Reviewed By: passy

Differential Revision: D29585448

fbshipit-source-id: 4c5d40b300a7b71eeb532f7be4765f742d239890

facebook/flipper,facebook/flipper,facebook/flipper,facebook/flipper,facebook/flipper,facebook/flipper,facebook/flipper,facebook/flipper,facebook/flipper,facebook/flipper,facebook/flipper