fix: no attribute error

[nhsiehgit]

per https://sentry-st.sentry.io/issues/5278445518/?project=1513938

the original code type-ignored the attr-defined.

bringing that back here so we hopefully don't run into this issue again

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.85%. Comparing base (7c48603) to head (8c936cd).
Report is 10 commits behind head on master.

❗ Current head 8c936cd differs from pull request most recent head cdd352d. Consider uploading reports for the commit cdd352d to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##           master   #69908   +/-   ##
=======================================
  Coverage   79.84%   79.85%           
=======================================
  Files        6489     6489           
  Lines      288550   288550           
  Branches    49687    49687           
=======================================
+ Hits       230404   230408    +4     
+ Misses      57748    57744    -4     
  Partials      398      398           

Files	Coverage Δ
src/sentry/api/serializers/models/alert_rule.py	98.42% <100.00%> (ø)

... and 3 files with indirect coverage changes

[sentry-io]

Suspect Issues

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

• ‼️ AttributeError: 'Rule' object has no attribute 'incident_id' /api/0/organizations/{organization_slug}/combin... View Issue

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