OpenRange/twitter-widget-pro — pull request #6 by mattyza (2013-06-12 11:18:43+00:00)
Title: Wraps OAuth verifier check in an is_wp_error() call.

Wraps OAuth verifier check in an is_wp_error() call, in case the request times out and WordPress returns a WP_Error object.

This is either due to slow internet connection, or if an error is presented and the user refreshes the URL returned from the Twitter API (this is the use case I encountered when discovering the PHP notice that was presented).