exit successful if nothing to do

update-gluon.sh

@@ -21,7 +21,7 @@ git fetch upstream --tags
 # we already have this branch - exit
 if ! git rev-parse --verify "$fork_newest_minor_branch" &> /dev/null; then
     echo "Nothing todo, branch $fork_newest_minor_branch already exists"
-    exit 1
+    exit 0
 fi
 
 git checkout "$upstream_newest_minor"