preserve arrays without @id

[seth-shaw-unlv]

GitHub Issue: #61

What does this Pull Request do?

Removes assumption that if the first array has '@id' then they all do. Now, just copy the value or check for deduplication if it has an '@id'.

What's new?

A in-depth description of the changes made by this PR. Technical details and
possible side effects.

• Changes NormalizerBase::deduplicateArrayOfIds to not just copy if the first one doesn't have '@id' but to also simply copy the array part if there isn't an '@id'.
• Does this change require documentation to be updated? No.
• Does this change add any new dependencies? No.
• Does this change require any other modifications to be made to the repository
  (i.e. Regeneration activity, etc.)? Clear cache.
• Could this change impact execution of existing code? Stop generating jsonld errors about missing '@id' keys.

How should this be tested?

Not sure. Never got around to figuring out exactly what combination of metadata generated this error.

Interested parties

@Islandora/committers, esp. @whikloj

[whikloj]

This seems like a good solution.

I was originally trying to build a test case to cause the error but I couldn't get it there.

[whikloj]

@rosiel @kstapelfeldt Could someone with access update the required checks on this repository please.

[seth-shaw-unlv]

@whikloj, branch protection rules have been updated. You are cleared to merge.