git-gui: avoid exception upon Ctrl+T in an empty list

diff --git a/git-gui.sh b/git-gui.sh
index 5bc21b878d413e27de8e3d54e66a138ff41c7daa..3ce2e04bc58ee2c0f17cf86b4d72bab7549b3f78 100755 (executable)
--- a/git-gui.sh
+++ b/git-gui.sh
@@ -2505,6 +2505,10 @@ proc toggle_or_diff {mode w args} {
                if {$last_clicked ne {}} {
                        set lno [lindex $last_clicked 1]
                } else {
+                       if {[llength $file_lists($w)] == 0} {
+                               set last_clicked {}
+                               return
+                       }
                        set lno [expr {int([lindex [$w tag ranges in_diff] 0])}]
                }
                if {$mode eq "toggle"} {