Description of problem:
# yum -y update
Loaded plugins: langpacks
Repository 'repository_url': Error parsing config: Error parsing "baseurl = 'repository_url'": URL must be http, ftp, file or https not ""

(process:19483): GLib-WARNING **: GError set over the top of a previous GError or uninitialized memory.
This indicates a bug in someone's code. You must ensure an error is NULL before it's set.
The overwriting error message was: Parsing primary.xml error: Start tag expected, '<' not found

Traceback (most recent call last):
  File "/usr/bin/yum", line 29, in <module>
    yummain.user_main(sys.argv[1:], exit_code=True)
  File "/usr/share/yum-cli/yummain.py", line 371, in user_main
    errcode = main(args)
  File "/usr/share/yum-cli/yummain.py", line 174, in main
    result, resultmsgs = base.doCommands()
  File "/usr/share/yum-cli/cli.py", line 584, in doCommands
    return self.yum_cli_commands[self.basecmd].doCommand(self, self.basecmd, self.extcmds)
  File "/usr/share/yum-cli/yumcommands.py", line 494, in doCommand
    ret = base.updatePkgs(extcmds, update_to=(basecmd == 'update-to'))
  File "/usr/share/yum-cli/cli.py", line 1046, in updatePkgs
    self.update()
  File "/usr/lib/python2.7/site-packages/yum/__init__.py", line 5051, in update
    updates = self.up.getUpdatesTuples()
  File "/usr/lib/python2.7/site-packages/yum/__init__.py", line 1101, in <lambda>
    up = property(fget=lambda self: self._getUpdates(),
  File "/usr/lib/python2.7/site-packages/yum/__init__.py", line 846, in _getUpdates
    self._up = rpmUtils.updates.Updates(self.rpmdb.simplePkgList(), self.pkgSack.simplePkgList())
  File "/usr/lib/python2.7/site-packages/yum/__init__.py", line 1082, in <lambda>
    pkgSack = property(fget=lambda self: self._getSacks(),
  File "/usr/lib/python2.7/site-packages/yum/__init__.py", line 786, in _getSacks
    self.repos.populateSack(which=repos)
  File "/usr/lib/python2.7/site-packages/yum/repos.py", line 383, in populateSack
    sack.populate(repo, mdtype, callback, cacheonly)
  File "/usr/lib/python2.7/site-packages/yum/yumRepo.py", line 263, in populate
    dobj = repo_cache_function(xml, csum)
  File "/usr/lib/python2.7/site-packages/sqlitecachec.py", line 46, in getPrimary
    self.repoid))
TypeError: Parsing primary.xml error: Document is empty



Version-Release number of selected component (if applicable):Fedora 21