Orphaned editions passed to MergeUI crashing script

[mheiman]

Problem

MergeUI will crash if passed orphaned editions that have an authors field. The merge process doesn't actually care, but the enhancement that was added to display author names doesn't take into account the different authors field structures between works and editions.

Reproducing the bug

Here's an example of a merge that crashes the interface:

https://openlibrary.org/works/merge?records=OL14857756W,OL24198259M

You can see the errors in the console.

Context

• Browser (Chrome, Safari, Firefox, etc): N/A
• OS (Windows, Mac, etc): N/A
• Logged in (Y/N): Y
• Environment (prod, dev, local): prod

Breakdown

Requirements Checklist

All that's required is adding code to handle the difference in author data between works and editions. I'll be making a pull request shortly.

Stakeholders

@mheiman

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