[PATCH 3/4] git-gui: fix exception when trying to stage with empty file list

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If there is nothing to stage, there is nothing to stage. Let's not try
to, even if the file list contains nothing at all.

This fixes https://github.com/git-for-windows/git/issues/1075

Signed-off-by: Johannes Schindelin <johannes.schindelin@xxxxxx>
---
 git-gui/git-gui.sh | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/git-gui/git-gui.sh b/git-gui/git-gui.sh
index 3c085cddc61..ca2cdebdc4f 100755
--- a/git-gui/git-gui.sh
+++ b/git-gui/git-gui.sh
@@ -2504,7 +2504,9 @@ proc toggle_or_diff {mode w args} {
 		if {$last_clicked ne {}} {
 			set lno [lindex $last_clicked 1]
 		} else {
-			if {[llength $file_lists($w)] == 0} {
+			if {![info exists file_lists]
+				|| ![info exists file_lists($w)]
+				|| [llength $file_lists($w)] == 0} {
 				set last_clicked {}
 				return
 			}
@@ -2518,7 +2520,13 @@ proc toggle_or_diff {mode w args} {
 		}
 	}
 
-	set path [lindex $file_lists($w) [expr {$lno - 1}]]
+	if {![info exists file_lists]
+		|| ![info exists file_lists($w)]
+		|| [llength $file_lists($w)] < $lno - 1} {
+		set path {}
+	} else {
+		set path [lindex $file_lists($w) [expr {$lno - 1}]]
+	}
 	if {$path eq {}} {
 		set last_clicked {}
 		return
-- 
2.15.1.windows.2.395.g5bb0817ee52





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