fix bug when no patch selected

Author: km4ack

patch-menu

@@ -22,6 +22,7 @@ yad --title="Build a Pi Patch Tool" --width=500 --height=500 \
     --button="Apply Patch":2)
 BUT=$?
 
+
 PATCH=$(echo ${INFO} | awk -F "|" '{print $1}')
 
 #cleanup and exit upon user request
@@ -32,6 +33,17 @@ rm -rf $TEMP $DIR/pi-build
 ${MYPATH}/update && exit
 fi
 
+
+#check to verify that a patch has been selected
+#Thank Ken, NB6S for catching this bug!
+if [ -z $INFO ]; then
+	yad --form --width=500 --text-align=center --center --title="Build-a-Pi Patch Tool" --text-align=center \
+		--image ${LOGO} --window-icon=${LOGO} --image-on-top --separator="|" --item-separator="|" \
+		--text="<b>Please select a patch\rand try again.</b>" \
+		--button=gtk-close
+MENU
+fi
+
 #verify patch has not been applied already
 echo "getting patchname"
 PATCHNAME=$(grep PATCHNAME= $DIR/pi-build/patch/${PATCH} | sed 's/PATCHNAME=//')