Fix #overdue? on issues without severity label
Fix error #670 (closed) when determining whether issues without severity labels are overdue.
The error causes the entire group report to fail.
Action items
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(If applicable) Add documentation to the handbook pages for Triage Operations => - (If applicable) Identify the affected groups and how to communicate to them:
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/cc @ person_or_group
=> -
Relevant Slack channels => -
Week-in-review
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Edited by Albert