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

[Roland Eggner]

# HG changeset patch
# Parent 81e0cc02b93d4a07a05ac83803b4ef6c4c61c596
[enhancement 3] 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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