bito-code-review[bot] commented on PR #38086:
URL: https://github.com/apache/superset/pull/38086#issuecomment-3926103873

   <!-- Bito Reply -->
   The `?` adds optional chaining to prevent errors if `formulaSeries.data` is 
undefined. Without it, accessing `.length` or `[0]` on an undefined value would 
throw a TypeError. This makes the test more robust, likely due to potential 
undefined data in some scenarios.


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