make-stable: Gracefully skip directories that do not exist

scripts/make-stable.sh

@@ -20,6 +20,12 @@ DIRS="images ipk sdk tools cache-state sources cache conf"
 
 for i in $DIRS;
 do
+	if [ ! -e $PWD/web-files/$MACHINE/$RELEASE-testing/$i ]; then
+		echo "Skipping $i, directory doesn't exist"
+		echo ""
+		continue
+	fi
+
 	echo "Working on $i"
 	rsync $ARGS --delete -avH \
 		--link-dest=$PWD/web-files/$MACHINE/$RELEASE-testing/$i \