minor issues with arg passing

util/update_theme_repo

@@ -1,10 +1,15 @@
 #!/bin/sh -f
 
-if [ $# -eq '2' ]; then
-	echo usage: $0 nickname
+
+if [ $# -ne 1 ]; then
+	echo usage: $0 repository
+	echo "Repositories:"
+	ls extend/theme
 	exit 1
 fi
 
 cd extend/theme/$1
-git pull
 
+if [ -d .git ] ; then
+	git pull
+fi