Merge pull request #904 from progrium/mh-nullglob-in-ps-restartall

prevent error on restartall when no apps deployed

plugins/ps/commands

@@ -67,6 +67,7 @@ case "$1" in
   ;;
 
   ps:restartall)
+    shopt -s nullglob
     for app in $DOKKU_ROOT/*/CONTAINER; do
       APP=$(basename "$(dirname $app)");
       dokku ps:restart $APP