vshCommandOpt: Allow caller avoiding assert()
In the future, completer callbacks will receive partially parsed command (and thus possibly incomplete). However, we still want them to use command options fetching APIs we already have (e.g. vshCommandOpt*()) and at the same time don't report any errors (nor call any asserts). Signed-off-by: NMichal Privoznik <mprivozn@redhat.com> Reviewed-by: NJohn Ferlan <jferlan@redhat.com>
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