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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Name	Link	Commit	Status
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core-coverage	Visit	28275ef	✅
cron-coverage	Visit	28275ef	✅
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graphql-coverage	Visit	28275ef	✅
rtc-test-results	Visit	28275ef	✅
core-test-results	Visit	28275ef	✅
cron-test-results	Visit	28275ef	✅
email-test-results	Visit	28275ef	✅
worker-test-results	Visit	28275ef	✅
graphql-test-results	Visit	28275ef	✅

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