Handle nil value for role repos

[michaeljguarino]

Summary

Only ever seen this once, but should be resolvable

Test Plan

n/a

Checklist

• [ ] If required, I have updated the Plural documentation accordingly.
• [ ] I have added tests to cover my changes.
• [ ] I have added a meaningful title and summary to convey the impact of this PR to a user.
• [ ] I have added relevant labels to this PR to help with categorization for release notes.

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cron-test-results	Visit	28275ef6c795bdc21db0569b2bdc61a70d29e524	✅
email-test-results	Visit	28275ef6c795bdc21db0569b2bdc61a70d29e524	✅
worker-test-results	Visit	28275ef6c795bdc21db0569b2bdc61a70d29e524	✅
graphql-test-results	Visit	28275ef6c795bdc21db0569b2bdc61a70d29e524	✅

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