If ExceptionsManager.handleException throws, throw the original error

Summary:
This will let the JSC exception handling catch the error, and
display it in a red box.

Reviewed By: yungsters

Differential Revision: D3468336

fbshipit-source-id: b89335dbcebf16a881bba783c68242e2b0cd509f

Libraries/JavaScriptAppEngine/Initialization/InitializeJavaScriptAppEngine.js

@@ -136,6 +136,7 @@ function setUpErrorHandler() {
       require('ExceptionsManager').handleException(e, isFatal);
     } catch (ee) {
       console.log('Failed to print error: ', ee.message);
+      throw e;
     }
   }