fix syntax

moto/elbv2/models.py

@@ -113,7 +113,6 @@ class FakeListener(BaseModel):
     def rules(self):
         return self._non_default_rules + [self._default_rule]
 
-
     def register(self, rule):
         self._non_default_rules.append(rule)
         self._non_default_rules = sorted(self._non_default_rules, key=lambda x: x.priority)
@@ -220,7 +219,7 @@ class ELBv2Backend(BaseBackend):
     def create_rule(self, listener_arn, conditions, priority, actions):
         listeners = self.describe_listeners(None, [listener_arn])
         if not listeners:
-            raise ListenerNotFound()
+            raise ListenerNotFoundError()
         listener = listeners[0]
 
         # validate conditions
@@ -450,7 +449,6 @@ class ELBv2Backend(BaseBackend):
         rule.actions = actions
         return [rule]
 
-
     def register_targets(self, target_group_arn, instances):
         target_group = self.target_groups.get(target_group_arn)
         if target_group is None:

moto/elbv2/responses.py

@@ -905,7 +905,6 @@ DESCRIBE_TARGET_HEALTH_TEMPLATE = """<DescribeTargetHealthResponse xmlns="http:/
   </ResponseMetadata>
 </DescribeTargetHealthResponse>"""
 
-
 SET_RULE_PRIORITIES_TEMPLATE = """<SetRulePrioritiesResponse xmlns="http://elasticloadbalancing.amazonaws.com/doc/2015-12-01/">
   <SetRulePrioritiesResult>
     <Rules>