https://bugzilla.wikimedia.org/show_bug.cgi?id=53556

       Web browser: ---
            Bug ID: 53556
           Summary: A single colon (:) as title is handled differently
           Product: MediaWiki
           Version: 1.22-git
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: Unprioritized
         Component: General/Unknown
          Assignee: wikibugs-l@lists.wikimedia.org
          Reporter: duplicate...@googlemail.com
    Classification: Unclassified
   Mobile Platform: ---

The string ':' is treated differently. It is a valid title in Title.php, but
also a bad title at other situation:
* Gives no 'invalid': https://en.wikipedia.org/w/api.php?action=query&titles=:
* {{fullurl::}} gives a '//en.wikipedia.org/wiki/'
* but {{fullurl:>}} as invalid title would not parsed
* [[:]] is not parsed
* You cannot view the page corrosponding to :
https://en.wikipedia.org/w/index.php?title=:
* Using api action=edit gives a exception:
error;{code=internal_api_error_MWException, info=Exception Caught: Something is
trying to edit an article with an empty title};
* A move will give articleexists, because there is strlen < 1 check.
* api action=protect allows the (create) protection of that title

In my opinion Title::secureAndSplit should reject a single colon as title.

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