add more details to the error message when catching NSInternalInconsi…

…stencyException

Summary: We want to remove this exception handling, but we're seeing quite a lot of `IGFailure` happening recently. Lets improve the error message to make it easier to debug. Once we get down to a reasonable number, we can remove it.

Reviewed By: fabiomassimo

Differential Revision: D52564499

fbshipit-source-id: f70ca2f0f0f8124377eeb2a219878dfa019af87c

Source/IGListKit/Internal/IGListBatchUpdateTransaction.m

@@ -234,7 +234,7 @@ - (void)_applyDiff:(IGListIndexSetResult *)diffResult {
             /// with our product team to properly fix their data source changes outside of the -performBatchUpdatesBlock:
             /// IGLisKit processed a new being as an assert that requires investigation,
             /// since it will be processed as invalid data source state that needs a reload.
-            IGFailure(@"The data source returned an invalid number of sections and rows due to updates applied outside of the performBatchUpdates block. This will cause a crash.");
+            IGFailure(@"IGListKit caught exception (%@): %@", exception.name, exception.reason);
             [self begin];
             return;
         } else {