Made the 'New Project' button use OO.ui.Process properly, so that we get error handling.
Made the 'New Project' button use OO.ui.Process properly, so that we get
error handling.

cse-bristol/steep-mediawiki-gadgets,cse-bristol/steep-mediawiki-gadgets,cse-bristol/steep-mediawiki-gadgets,cse-bristol/steep-mediawiki-gadgets