mediawiki.action.view.dblClickEdit: Do not call click on undefined

Not all pages in a MediaWiki installation have an edit link. For
example the pages in Wikidata do not have it.

Bug: 57713
Change-Id: I842c1224d15887d59eab73f2b222c232a05c0bd9
Merge "mediawiki.action.view.dblClickEdit: Do not call click on undefined"