tests/input/logictree: make sure that validate_*() methods aren't called
tests/input/logictree: make sure that validate_*() methods aren't called

... when they should not be


Former-commit-id: 42fa76a3c6f23e2f34e8187d852f1625442a7006
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine