serverless: sanitize concurrency_modifier output in JobScaler #476
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Hi,
This PR hardens JobScaler scaling when a user-provided concurrency_modifier returns an invalid value (None / 0 / negative / non-int), preventing crashes like:
TypeError: '<' not supported between instances of 'int' and 'NoneType'
It validates/coerces the value to a safe int >= 1 and adds unit tests for the invalid-value cases.
Related: #458