Skip when target raises UnsupportedPage
Skip when target raises UnsupportedPage

An UnsupportedPage is raised when the target is a Special: page or
a Media: page. Now it will be skipped.

Change-Id: Ia5a2d626e0071dcf358b7c5e04014247c847f936

wikimedia/pywikibot-core,magul/pywikibot-core,magul/pywikibot-core,PersianWikipedia/pywikibot-core,wikimedia/pywikibot-core