Description of problem:
When neither mirrorlist nor baseurl are defined for a repository, dnf will
crash with the following stack trace:

$ sudo dnf check-update
Failed to set locale, defaulting to C
Traceback (most recent call last):
  File "/bin/dnf", line 35, in <module>
    main.user_main(sys.argv[1:], exit_code=True)
  File "/usr/lib/python2.7/site-packages/dnf/cli/main.py", line 304, in user_main
    errcode = main(args)
  File "/usr/lib/python2.7/site-packages/dnf/cli/main.py", line 39, in main
    _main(base, args)
  File "/usr/lib/python2.7/site-packages/dnf/cli/main.py", line 135, in _main
    result, resultmsgs = cli.run()
  File "/usr/lib/python2.7/site-packages/dnf/cli/cli.py", line 1295, in run
    return self.command.doCommand(self.base.basecmd, self.base.extcmds)
  File "/usr/lib/python2.7/site-packages/dnf/cli/commands.py", line 1206, in doCommand
    local = po.localPkg()
  File "/usr/lib/python2.7/site-packages/dnf/package.py", line 160, in localPkg
    os.path.join(self.repo.pkgdir, os.path.basename(self.location))
  File "/usr/lib/python2.7/site-packages/dnf/repo.py", line 449, in pkgdir
    if self._local_origin:
  File "/usr/lib/python2.7/site-packages/dnf/repo.py", line 210, in _local_origin
    if self.baseurl[0].startswith('file://'):
IndexError: list index out of range


Version-Release number of selected component (if applicable):
$ dnf --version
Failed to set locale, defaulting to C
0.3.7
  Installed: dnf-0:0.3.7-1.gitf8bdc98.fc19.noarch at 2013-05-31 14:14
  Built    : Fedora Project at 2013-05-29 12:41

  Installed: rpm-0:4.11.0.1-2.fc19.x86_64 at 2013-06-03 14:13
  Built    : Fedora Project at 2013-05-28 07:16


How reproducible:
always


Steps to Reproduce:
1. Comment out both "baseurl" and "mirrorlist" in /etc/yum.repos.d/fedora.repo
2. run dnf check-update
3.


Actual results:
dnf crashes


Expected results:
1. dnf should not crash and skip the misconfigured repository
2. dnf should show an error message explaining the misconfiguration