Description of problem:
'://' in pkg, the pkg should implement __contains__ method:

def __contains__(self, key):
	return hasattr(self, key)

Version-Release number of selected component:
koji-builder-1.8.0-2.fc20

Additional info:
reporter:       libreport-2.1.10
cmdline:        /usr/bin/python /usr/libexec/kojid/mergerepos -a x86 -b /mnt/koji/repos/dist-test-build/6/x86/blocklist -o /tmp/koji/tasks/16/16/repo -g /mnt/koji/repos/dist-test-build/6/groups/comps.xml -r file:///tmp/koji/tasks/16/16/repo_6_premerge/ -r http://mirrors.163.com/fedora/releases/19/Everything/x86_64/os/
executable:     /usr/libexec/kojid/mergerepos
kernel:         3.12.5-302.fc20.x86_64
runlevel:       N 5
type:           Python
uid:            0

Truncated backtrace:
packages.py:384:__getitem__:TypeError: getattr(): attribute name must be string

Traceback (most recent call last):
  File "/usr/libexec/kojid/mergerepos", line 262, in <module>
    main(sys.argv[1:])
  File "/usr/libexec/kojid/mergerepos", line 257, in main
    merge.write_metadata()
  File "/usr/libexec/kojid/mergerepos", line 237, in write_metadata
    mdgen.doPkgMetadata()
  File "/usr/lib/python2.7/site-packages/createrepo/__init__.py", line 405, in doPkgMetadata
    if '://' in pkg: # remote
  File "/usr/lib/python2.7/site-packages/yum/packages.py", line 384, in __getitem__
    return getattr(self, key)
TypeError: getattr(): attribute name must be string

Local variables in innermost frame:
self: <YumAvailablePackageSqlite : 0ad-data-0.0.13-1.fc19.noarch (0x1725150)>
key: 0