midori-display: Handle situations where the Xserver has died and xprintidle does not produce output.

bin/midori-display

@@ -234,7 +234,7 @@ function midori_loop {
 		(
 			while [ -e "$session_lock" ]; do
 				sleep 1
-				if [ `xprintidle` -gt $(($INACTIVITY_INTERVAL*1000)) ]; then
+				if [ `xprintidle 2>/dev/null || echo 0` -gt $(($INACTIVITY_INTERVAL*1000)) ]; then
 					echo -n "RESTART" > $midori_lock
 					$OUTPUT "INFO: Triggering browser restart, too much idling around..."
 					# reset X11 idle counter by some harmless key event