Updated mediawiki/extensions
Project: mediawiki/extensions/Flow  ab8a1f00296030f15794f4dd59ed08e863b0e1d8

Fix WrongNumberArgumentsException

It should extend FlowException, and be moved to where other
specific exceptions live.

Change-Id: Idf8c57cf2109f88cf547e1c146b35c4eea8dc321