[patch enhancement 3] bash_completion: be compatible with “set -u”

[Roland Eggner]

# HG changeset patch
# Parent aacff37a76a4d952e3154fd5d67837c24767f281
bash_completion: be compatible with “set -u”

diff --git a/contrib/bash_completion b/contrib/bash_completion
--- a/contrib/bash_completion
+++ b/contrib/bash_completion
@@ -179,7 +179,7 @@ shopt -s extglob
 	;;
     esac
 
-    if [ -z "$cmd" ] || [ $COMP_CWORD -eq $i ]; then
+    if [[ -z "${cmd-}" ]] || [ $COMP_CWORD -eq $i ]; then
 	_hg_commands
 	return
     fi
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