Fixing rollout evaluation (#74)

Author: aliabbasrizvi

optimizely/decision_service.py

@@ -195,7 +195,7 @@ def get_variation_for_rollout(self, rollout, user_id, attributes=None):
           break
 
       # Evaluate last rule i.e. "Everyone Else" rule
-      everyone_else_experiment = rollout.experiments[-1]
+      everyone_else_experiment = self.config.get_experiment_from_key(rollout.experiments[-1].get('key'))
       if audience_helper.is_user_in_experiment(self.config,
                                                self.config.get_experiment_from_key(rollout.experiments[-1].get('key')),
                                                attributes):