Talend Display null as empty array

[Anonymous]

I new at talend stuck with a basic issue ,any help would be really appreicated I have a talend esb job that let me query my database via get request
Job Flow: 
Trestrequest==>tflowIterate==>Redshift==>txmlmap==>trestresponse


Call:
localhost/restaurant?rest_id=305&from_date=%272016-10-12%27&to_date=%272016-10-18%27&_=1476875037045

get the result(Json response)
{"root":{"combo3":[{"class1":11963,"class2":12405,"class3":13050,"count":12}

which is perfect and what is required
How can I handle 404 exception
for Talend ESB and display {}

(in web page or web browser)
Right now I only see empty webpage as result but how can I replace it with   {} (in web page or web browser)

[Anonymous]

Hi 
404 exception means no data found, you may check if any data are found from database and then send different result as response based on the checking result, eg:
Trestrequest==>tflowIterate==>Redshift==tHashOutput--runIf1--tHashInput-->txmlmap==>trestresponse1
                                                                                   --runIf2--tFixedFlowInput--> trestresponse1

set the condition of runif1 as:
((Integer)globalMap.get("tRedshiftInput_1_NB_LINE"))>0

tHashInput: read the data from memory, check 'clear cache after reading' box.




set the condition of runif2 as:
((Integer)globalMap.get("tRedshiftInput_1_NB_LINE"))==0

tFixedFlowInput:define the return value "{}" if no data are found from database.


Regards
Shong