Bug#656640: system-config-printer: Error about unknown IPP tag when opening any printer

[Rob Adams]

I was able to get rid of this error by installing python-cups-1.9.55. 

See also:
   http://git.fedorahosted.org/git/?p=pycups.git;a=commit;h=34d07f5d6489af1f5895ee210dc8ec130583903a
   https://admin.fedoraproject.org/updates/python-cups-1.9.55-1.fc15