Updated mediawiki/extensions
Project: mediawiki/extensions/Flow  73a9afca78c78db9446e1d9f3be9e0809a86d57f

Catch and specially handle InvalidArgumentException

Prevents exception messages when showing up
if a user manually goes to ?action=invalid.

Bug: 60936
Change-Id: I05d6be4a59db57c24bd9a11c499cb69f18feaa41