Fix AttributeError on line 51 (#280)
Fix AttributeError on line 51 (#280)

Fixes:
File "/var/www/sixpack/venv_sixpack/local/lib/python2.7/site-packages/sixpack/server.py",
 line 51, in get_origin
 return origin if self.origin_regexp.match(origin) else "null"
 AttributeError: 'NoneType' object has no attribute 'match'
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