Remove blank entry from dialer menu

scripts/modem/sxmo_modemcall.sh

@@ -58,6 +58,7 @@ dialmenu() {
   CONTACTS="$(contacts)"
 	NUMBER="$(
 		echo -e "Close Menu\n$CONTACTS" | 
+		grep . |
 		sxmo_dmenu_with_kb.sh -l 10 -p Number -c -fn Terminus-20
 	)"
 	echo "$NUMBER" | grep "Close Menu" && kill 0