Description of problem:

If 'yum' is called like, say, that:

    yum -c ./local.conf update

but local.conf does not exist (a typo in a path, or temporary inaccesible
if retrieved over a network) then, instead of bailing out with an error
message, 'yum' produces this misleading traceback:

Traceback (most recent call last):
  File "/usr/bin/yum", line 29, in ?
    yummain.main(sys.argv[1:])
  File "/usr/share/yum-cli/yummain.py", line 80, in main
    base.getOptionsConfig(args)
  File "/usr/share/yum-cli/cli.py", line 169, in getOptionsConfig
    self.doConfigSetup(fn=opts.conffile, root=root)
  File "/usr/lib/python2.4/site-packages/yum/__init__.py", line 97, in doConfigSetup
    self.conf = config.readMainConfig(fn, root)
  File "/usr/lib/python2.4/site-packages/yum/config.py", line 482, in readMainConfig
    setattr(yumconf, option, yumconf.installroot + path)
  File "/usr/lib/python2.4/site-packages/yum/config.py", line 72, in __set__
    optdata.parser.set(optdata.section, optdata.name, strvalue)
  File "/usr/lib/python2.4/site-packages/yum/parser.py", line 181, in set
    return ConfigParser.set(self, section, option, value)
  File "/usr/lib64/python2.4/ConfigParser.py", line 358, in set
    raise NoSectionError(section)
ConfigParser.NoSectionError: No section: 'main'

Indeed, there is no section 'main', or any other one, if the file cannot
be accessed.

Version-Release number of selected component (if applicable):
yum-2.5.1-2