Description of problem:
trying to tab-complete dnf command while being offline (misconfigured routing)

Version-Release number of selected component:
python-dnf-1.0.2-3.fc22

Additional info:
reporter:       libreport-2.6.2
cmdline:        python2 /usr/lib/python2.7/site-packages/dnf/cli/completion_helper.py list list insta -d 0 -q -C
executable:     /usr/lib/python2.7/site-packages/dnf/cli/completion_helper.py
kernel:         4.1.3-201.fc22.x86_64
runlevel:       N 5
type:           Python
uid:            1000

Truncated backtrace:
repo.py:793:load:RepoError: Cache-only enabled but no cache for 'fedora'

Traceback (most recent call last):
  File "/usr/lib/python2.7/site-packages/dnf/cli/completion_helper.py", line 191, in <module>
    main(sys.argv[1:])
  File "/usr/lib/python2.7/site-packages/dnf/cli/completion_helper.py", line 187, in main
    cli.run()
  File "/usr/lib/python2.7/site-packages/dnf/cli/cli.py", line 1075, in run
    self._process_demands()
  File "/usr/lib/python2.7/site-packages/dnf/cli/cli.py", line 797, in _process_demands
    load_available_repos=lar)
  File "/usr/lib/python2.7/site-packages/dnf/base.py", line 243, in fill_sack
    self._add_repo_to_sack(r.id)
  File "/usr/lib/python2.7/site-packages/dnf/base.py", line 103, in _add_repo_to_sack
    repo.load()
  File "/usr/lib/python2.7/site-packages/dnf/repo.py", line 793, in load
    raise dnf.exceptions.RepoError(msg)
RepoError: Cache-only enabled but no cache for 'fedora'

Local variables in innermost frame:
msg: u"Cache-only enabled but no cache for 'fedora'"
self: <Repo fedora>