cursor fix

Author: nikkikapadia

src/sentry/snuba/snuba_query_validator.py

@@ -406,7 +406,7 @@ def _validate_group_by(self, value: Sequence[str] | None) -> Sequence[str] | Non
     @override
     def create_source(self, validated_data) -> QuerySubscription:
         extrapolation_mode = validated_data.get("extrapolation_mode")
-        if extrapolation_mode:
+        if extrapolation_mode is not None:
             extrapolation_mode = ExtrapolationMode(extrapolation_mode)
         snuba_query = create_snuba_query(
             query_type=validated_data["query_type"],