Comment 2 for bug 1302019

It looks like the check is based on deployed servers:

class Flavor {

.
.
.

    @classmethod
    @memoized.memoized
    @handle_errors(_("Unable to retrieve existing servers list."), [])
    def list_deployed_ids(cls, request):
        """Get and memoize ID's of deployed flavors."""
        servers = nova.server_list(request)[0]
        return set(server.flavor['id'] for server in servers)

Should it also be based on whether a flavor is associated with a role?