Updated mediawiki/extensions
Project: mediawiki/extensions/Flow  d5392d0cd3e9a34e757d0066210cc1c79a5bf812

Make error reporting more verbose.

Based on $wgShowExceptionDetails, MWException outputs a stack trace. Our own
implementation omitted this.

It should now still add our own (more user-friendly) error message, but also
call MWException's getHTML, which may output a stack trace too.

Change-Id: Iceb03ea22080903cd4f9897a9bf77428a6100c8e