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Description of problem:

Command yum provides ""  generates traceback.

Version-Release number of selected component (if applicable):
yum-3.2.29-22.el6.noarch

How reproducible:
100%

Steps to Reproduce:
1. yum provides ""

  
Actual results:
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 276, in user_main
    errcode = main(args)
  File "/usr/share/yum-cli/yummain.py", line 129, in main
    result, resultmsgs = base.doCommands()
  File "/usr/share/yum-cli/cli.py", line 438, in doCommands
    return self.yum_cli_commands[self.basecmd].doCommand(self, self.basecmd, self.extcmds)
  File "/usr/share/yum-cli/yumcommands.py", line 616, in doCommand
    return base.provides(extcmds)
  File "/usr/share/yum-cli/cli.py", line 1122, in provides
    callback_has_matchfor=True)
  File "/usr/lib/python2.6/site-packages/yum/__init__.py", line 2643, in searchPackageProvides
    isglob, canBeFile = _arg_data(arg)
  File "/usr/lib/python2.6/site-packages/yum/__init__.py", line 2630, in _arg_data
    if arg[0] != '/':
IndexError: string index out of range


Expected results:
No Traceback.

Additional info:

 Fix upstream, simple couple of lines.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

http://rhn.redhat.com/errata/RHBA-2012-0857.html