How to exclude untagged Images from being replicated?

Hey,

I am fiddling around with replication rules right now.

Given this project I want to replicate:

repo1: image1:1-SNAPSHOT,latest image2: untagged image3: untagged

My replication rule looks like this (pull):

Source resource filter Name: project/** Tag: excluding {*-SNAPSHOT,*.*.*-SNAPSHOT,latest}

This exludes the first image from being replicated as I want to. But how do I exclude untagged images in a replication rule?

Thanks for any hints