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fix(bucketer): Don't log invalid variation ID warning when bucketed into a traffic allocation range with empty string entityId (#549)

Summary:

Fix an issue introduced in #515. When bucket returns empty string, we shouldn't log a warning about invalid variation ID. Empty string is a valid value for the entityId property of traffic allocation range objects. There is no invalid variation ID in this situation.

Test plan:

Manually tested with A/B tests and rollouts. Added new unit test.

Issues:

OASIS-6890

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