[Oaisys] Resolve testing issues

[ConnorSheremeta]

Full details on issues here: #1712

GetRecord

Get record does not work fully right now.
Issue: Cant find a matching record with that identifier due to the prefixed oai:era.library.ualberta.ca: on the identifiers. It works when the identifier is just the uuid.

ListRecords

List records works for the metadata prefix oai_dc but not oai_etdms.
Issues with oai_etdms:

• 500 from object.departments.first from app/decorators/metadata/oai_etdms/thesis_decorator.rb:47:in discipline'`.
• Publisher field is never displayed.
• Degree name/grantor is sometimes not displayed.

The first issue in ListRecords can be resolved by using the safe navigator operator.

Once we've worked out all of the low-hanging bugs, reach out to Metadata and ask for their help verifying the output.

[ConnorSheremeta]

@sfarnel @danydvd
Regarding OAI:

We've noticed that some theses do not contain a degree name or grantor, also all theses do not contain a publisher. LAC has expressed that these fields are mandatory.

What should be a placeholder for all publisher fields? Also, what should the placeholders be if the degree name or degree grantor is missing?