fix(experiments): Handle None value for exposure_criteria

[danielbachhuber]

Follow up from #29015
Fixes https://posthog.sentry.io/issues/6320840804/

Changes

Safely handles None in exposure_criteria field.

How did you test this code?

Tests should pass.

[greptile-apps]

PR Summary

This PR adds null safety checks for handling None values in the exposure_criteria field across experiment query runners, fixing a Sentry error where the code attempted to access properties of a None value.

• Added null checks in ExperimentExposuresQueryRunner._get_exposure_query() before accessing exposure_criteria.get() properties
• Modified create_experiment() method in test files to explicitly handle exposure_criteria=None parameter
• Added safety checks in ExperimentQueryRunner._get_experiment_query() to prevent NoneType attribute errors
• Updated test cases to verify proper handling of both None and explicitly set exposure_criteria values

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