fix(alerts): avoid AttributeError in EventAttributeCondition

[cathteng]

Fixes SENTRY-3H0X

[codecov]

Codecov Report

Attention: Patch coverage is 63.63636% with 4 lines in your changes missing coverage. Please review.

✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
src/sentry/rules/conditions/event_attribute.py	63.63%	1 Missing and 3 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #79799      +/-   ##
==========================================
- Coverage   78.09%   78.09%   -0.01%     
==========================================
  Files        7178     7178              
  Lines      317128   317137       +9     
  Branches    43722    43726       +4     
==========================================
- Hits       247665   247662       -3     
- Misses      63118    63124       +6     
- Partials     6345     6351       +6     

[ceorourke]

Why is this one stringified?

[cathteng]

mypy gets angry

[ceorourke]

Weird, could we run into a problem later on with a string of 'None' though?

[cathteng]

replaced with hasattr

[sentry-io]

Suspect Issues

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

• ‼️ SnubaError: HTTPConnectionPool(host='127.0.0.1', port=1218): Max retries exceeded with url: /tests/events/eve... pytest.runtest.protocol tests/sentry/rules/cond... View Issue
• ‼️ SnubaError: HTTPConnectionPool(host='127.0.0.1', port=1218): Max retries exceeded with url: /tests/events/eve... pytest.runtest.protocol tests/sentry/rules/cond... View Issue

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