Updated mediawiki/extensions
Project: mediawiki/extensions/Parsoid  be773129622211f58c4cb549253b0bb142c45d73

Error handling crashers/fixes to roundtrip-test.js

* Error handling code was crashing (!!) :)
* Console-logging error handler was not emitting useful info
  on does-not-exists errors for wiki pages.
* Fixed and tested.

Change-Id: I9a4183761bc79d7c5e577e9485031408d1f6ffe9