F fix reference list

Summary

For #5 (closed). Fixes a bug (or two) that prevented list insertion.

Focus

Datatypes of properties are now forced to db.LIST if the value is a list instance.

Test Environment

Use zmt testdata, i.e.,

1. start zmt server-profile in local-crawler-prototype branch
2. install the crawler in this branch
3. execute './crawl.sh' in ZMT's dataset-crawler repo

Verify that the newly created dataset Record has a list of events and authors (compare with metadata.json in server-profile/integration-test/data/35/03...)

Check List for the Author

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• [ ] All automated tests pass
• Reference related issues
• [ ] Up-to-date CHANGELOG.md (or not necessary)
• Annotations in code (Gitlab comments)
  • Intent of new code
  • Problems with old code
  • Why this implementation?

Check List for the Reviewer

• I understand the intent of this MR
• All automated tests pass
• Up-to-date CHANGELOG.md (or not necessary)
• The test environment setup works and the intended behavior is reproducible in the test environment
• In-code documentation and comments are up-to-date.
• Check: Are there specifications? Are they satisfied?

For further good practices have a look at our review guidelines.