imprint: ui serializer and missing fields

[tmorrell]

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Description

This fixes a bug in the imprint formatting. When ISBN or place (not required fields) are missing, some extraneous formatting characters appear in the UI:

This fix borrows some ideas from the journal serializer to not render out non-required fields.

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[tmorrell]

We also noticed that the imprint serializer was missing the title and ISBN fields, so they never displayed on the landing page. I've modified this PR to display those as well, working off an approximate Chicago style.

[github-actions]

This PR was automatically marked as stale.

[lnielsen]

Merged as part of #1524