Fix mangling of wikipedia links
Fix mangling of wikipedia links

Bail out straight away if the tag value is a URL rather than waiting
until we have parsed the key as we may change the value in the process
of parsing the key.

tillmo/do-roam,tillmo/do-roam,tillmo/do-roam,tillmo/do-roam,tillmo/do-roam,tillmo/do-roam