fix km4ack#448

Author: km4ack

update

@@ -320,7 +320,7 @@ fi
 #If VARA is chosen, make sure we have a Pi 4 to work with. 
 #As of 02OCT2022 the VARA installer only works with the Pi 4.
 VARA_CHK=$(grep VARA ${BASE})
-if [ -n $VARA_CHK ]; then
+if [ -n "$VARA_CHK" ]; then
 	FREEMEM=$(free -m | grep Mem: | awk '{ print $2 }')
 	if [ $FREEMEM -lt 1500 ]; then
 	echo "Not enough memory available"