[PATCH] completion: fix zsh check under bash with 'set -u'

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Commit 06f44c3 (completion: make compatible with zsh) broke bash
compatibility with 'set -u': a warning was generated when checking
$ZSH_VERSION.  The solution is to supply a default value, using
${ZSH_VERSION-}.  Thanks to SZEDER GÃbor for the fix.

Signed-off-by: Mark Lodato <lodatom@xxxxxxxxx>
---
 contrib/completion/git-completion.bash |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/contrib/completion/git-completion.bash b/contrib/completion/git-completion.bash
index 64341d5..168669b 100755
--- a/contrib/completion/git-completion.bash
+++ b/contrib/completion/git-completion.bash
@@ -2345,7 +2345,7 @@ _git ()
 {
 	local i c=1 command __git_dir
 
-	if [[ -n $ZSH_VERSION ]]; then
+	if [[ -n ${ZSH_VERSION-} ]]; then
 		emulate -L bash
 		setopt KSH_TYPESET
 	fi
@@ -2394,7 +2394,7 @@ _git ()
 
 _gitk ()
 {
-	if [[ -n $ZSH_VERSION ]]; then
+	if [[ -n ${ZSH_VERSION-} ]]; then
 		emulate -L bash
 		setopt KSH_TYPESET
 	fi
@@ -2434,7 +2434,7 @@ complete -o bashdefault -o default -o nospace -F _git git.exe 2>/dev/null \
 	|| complete -o default -o nospace -F _git git.exe
 fi
 
-if [[ -n $ZSH_VERSION ]]; then
+if [[ -n ${ZSH_VERSION-} ]]; then
 	shopt () {
 		local option
 		if [ $# -ne 2 ]; then
-- 
1.7.3.2

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