Defaulting fetch to origin when set in the repo-config

Signed-off-by: Santi Béjar <sbejar@gmail.com>
Signed-off-by: Junio C Hamano <junkio@cox.net>

git-fetch.sh

@@ -70,6 +70,7 @@ case "$#" in
 0)
 	test -f "$GIT_DIR/branches/origin" ||
 		test -f "$GIT_DIR/remotes/origin" ||
+			git-repo-config --get remote.origin.url >/dev/null ||
 				die "Where do you want to fetch from today?"
 	set origin ;;
 esac