DNS rules referencing rule-sets that contain only ip_cidr predicates
silently stopped matching when legacy DNS mode was disabled, because the
IP-CIDR branch cannot match against an in-flight DNS query. The existing
validation intentionally let every rule_set through on the premise that
mixed sets still work via their non-IP branches, which is only true when
such a branch exists. Track whether a rule-set carries any non-IP-CIDR
predicate and reject pure-IP references the same way bare ip_cidr fields
are already rejected.
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