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Site.interwiki_prefix() should not fail if the interwiki is indirect
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Description

Steps to reproduce

After aplying patch for T188179 the methd fails in some cases, where no direct interwiki exists, like between mediawikiwiki and cs:wikisource:

$ python pwb.py shell
>>> s=pywikibot.Site('mediawiki', 'mediawiki')
>>> s2=pywikibot.Site('cs', 'wikisource')
>>> s.interwiki_prefix(s2)
Traceback (most recent call last):
  File "<console>", line 1, in <module>
  File "/home/pavel/pywikibot/pywikibot/site.py", line 972, in interwiki_prefix
    u"There is no interwiki prefix to '{0}'".format(site))
KeyError: "There is no interwiki prefix to 'wikisource:cs'"

But there is interwiki prefix, just it needs to be joined from two parts: s:cs: (or cs:s:).

There are two possible solutions:

  • teach interwiki_prefix() to glue prefix if this happens
  • leave interwiki_prefix() as is for these direct general prefixes and create some other method to do the glueing