Account for nil related_identifiers when indexing related_dois

[jrhoads]

Purpose

Related_identifiers may be nil. We need to makes sure we can handle this.

closes: #1058

Approach

Uses Array.Wrap to create an empty array if related_identifiers is nil.

Types of changes

• Bug fix (non-breaking change which fixes an issue)

• New feature (non-breaking change which adds functionality)

• Breaking change (fix or feature that would cause existing functionality to change)

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[jrhoads]

Current dependencies on/for this PR:

• master
  • PR Account for nil related_identifiers when indexing related_dois #1059 👈

This stack of pull requests is managed by Graphite.

[sentry-io]

Suspect Issues

This pull request was deployed and Sentry observed the following issues:

• ‼️ **NoMethodError: undefined method fetch' for "":String** app/models/doi/indexer/related_doi_indexer.rb i...` View Issue

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