This PR updates hibernate-core metadata and the test that captures annotations without attributes.
Those had been missed when collecting metadata in earlier runs since the loop did not consider the case of empty attributes returned by the AnnotationDescriptor. In case the annotation does not have any attributes the constructors of the hibernate internal annotation implementing types are now invoked, simulating what hibernate does internally during bootstrap via its ModelHelper .

What does this PR do?

Fixes: #700

Code sections where the PR accesses files, network, docker or some external service

• n/a

Checklist before merging

• I have considered including reachability metadata directly in the library or the framework (see our contributing document)
• I am the original author of all content provided in the pull request, and I did not copy the content from any other source (see the tests section from our contributing document)
• For all tests where I am not the sole author, I have added a comment that proves I may publish them under the specified license (see the tests section from our contributing document)
• I have properly formatted metadata files (see our formatting guide)
• I have added thorough tests (see the tests section from our contributing document)
• I have filled all places where my pull request accesses files, network, docker, or any other external service (see the section above)