[PATCH] git-gui: fix use of uninitialized variable

[Jens Lehmann <Jens.Lehmann@web.de>]

This fixes a bug introduced by the "display summary when showing diff of a
submodule" patch. It lead to a "no such variable" error when opening the
diff context menu while no diff was shown.

Signed-off-by: Jens Lehmann <Jens.Lehmann@web.de>
---

 git-gui/git-gui.sh |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/git-gui/git-gui.sh b/git-gui/git-gui.sh
index 3c0ce26..f727111 100755
--- a/git-gui/git-gui.sh
+++ b/git-gui/git-gui.sh
@@ -1132,6 +1132,7 @@ set current_branch {}
 set is_detached 0
 set current_diff_path {}
 set is_3way_diff 0
+set is_submodule_diff 0
 set is_conflict_diff 0
 set selected_commit_type new
 set diff_empty_count 0
-- 
1.6.5.rc2.5.gbbf1