bash_completion: don't complete export with "garbage" when mq is not around The "garbage" is the output of hg help printed when a command is not found.

#!/bin/sh

hg
hg -q
hg help
hg -q help
hg add -h
hg add --skjdfks
hg help diff
hg help status
hg -q help status
hg help foo
hg skjdfks

exit 0