update: Handle errors in decision result to prevent fallback to next experiment

Author: FarhanAnjum-opti

lib/optimizely/decision_service.rb

@@ -238,6 +238,10 @@ def get_variation_for_feature_experiment(project_config, feature_flag, user_cont
         variation_id = variation_result.variation_id
         cmab_uuid = variation_result.cmab_uuid
         decide_reasons.push(*reasons_received)
+
+        # If there's an error, return immediately instead of falling back to next experiment
+        return DecisionResult.new(nil, error, decide_reasons) if error
+
         next unless variation_id
 
         variation = project_config.get_variation_from_id_by_experiment_id(experiment_id, variation_id)