Fix security issue with empty password
Fix security issue with empty password

If no password is defined for user "web", insert "!" to disable authentication without a password.
newtonne/trellis,pressbooks/trellis,newtonne/trellis,buluma/trellis,newtonne/trellis,roots/bedrock-ansible,roots/bedrock-ansible,buluma/trellis,roots/trellis,buluma/trellis,roots/trellis,buluma/trellis,pressbooks/trellis