Update C9.yaml to address bug in error handling for C9 Instance Finder (#118)

Author: switch180

design-patterns/cloudformation/C9.yaml

@@ -318,7 +318,7 @@ Resources:
                       print(err)
                       status = cfnresponse.FAILED
                       print(traceback.format_exc())
-                      responseData = {'Error': traceback.format_exc(err)}
+                      responseData = {'Error': traceback.format_exc()}
                   finally:
                       cfnresponse.send(event, context, status, responseData, 'CustomResourcePhysicalID')
                       
@@ -736,4 +736,4 @@ Outputs:
     Description: Role Arn
     Value: !GetAtt Cloud9Role.Arn
     Export:
-      Name: Cloud9RoleArn
+      Name: Cloud9RoleArn