git-submodule: Avoid 'fatal: cannot describe' message
When "git submodule status" command tries to show the name of the submodule HEAD revision more descriptively, but the submodule repository lacked a suitable tag to do so, it leaked "fatal: cannot describe" message to the UI. Squelch it by using '--always'. Signed-off-by: NPing Yin <pkufranky@gmail.com> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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