Add a clear error message when trying to add/rm an invalid domain
Add a clear error message when trying to add/rm an invalid domain

nono/cozy-stack,nono/cozy-stack,sebn/cozy-stack,sebn/cozy-stack,nono/cozy-stack,sebn/cozy-stack,sebn/cozy-stack,nono/cozy-stack,nono/cozy-stack