Beta: Add hack to make edit page work again

it seems EditPage.php assumes a toolbar to be present provided
by mediawiki.action.edit - this is bad and should be fixed in core
This temporary hack ensures no errors are thrown and the user can
edit

Change-Id: I9b6ce9ec9b807fa69a5af56a92235d6053f95c98
Merge "Beta: Add hack to make edit page work again"