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[PATCH 2/4] git-gui: avoid exception upon Ctrl+T in an empty list

Previously unstaged files can be staged by clicking on them and then
pressing Ctrl+T. Conveniently, the next unstaged file is selected
automatically so that the unstaged files can be staged by repeatedly
pressing Ctrl+T.

When a user hits Ctrl+T one time too many, though, Git GUI used to throw
this exception:

	expected number but got ""
	expected number but got ""
	    while executing
	"expr {int([lindex [$w tag ranges in_diff] 0])}"
	    (procedure "toggle_or_diff" line 13)
	    invoked from within
	"toggle_or_diff toggle .vpane.files.workdir.list "
	    (command bound to event)

Let's just avoid that by skipping the operation when there are no more
files to stage.

This fixes https://github.com/git-for-windows/git/issues/1060

Signed-off-by: Johannes Schindelin <johannes.schindelin@xxxxxx>
 git-gui/git-gui.sh | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/git-gui/git-gui.sh b/git-gui/git-gui.sh
index ed24aa9d2f1..3c085cddc61 100755
--- a/git-gui/git-gui.sh
+++ b/git-gui/git-gui.sh
@@ -2504,6 +2504,10 @@ 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"} {