Don't hide exception messages during package load

Include the original error message if an error occurs finding the
package for a class. There may be some improvements that can be made,
but this makes the logs a little more useful.

Change-Id: I81b8cbcaea2773539aeabbdef6b2129cd28e28c3
Closes-Bug: #1348804
Merge "Don't hide exception messages during package load"