The top level object cannot be an array issue in dataservices

[dulanjalidilmi]

Description:
When the top-level object is an array in output mapping, DS Fault : The top level object cannot be an array occurs.
.
Affected Product Version:
1.1.0

Steps to reproduce:

1. configure a data service
2. configure output mapping similar to the following payload.

<result outputType="json">
{
     "employee": [
            {
                "first_name": "$first_name"
            }
      ]
}
</result>

3. Deploy the CAPP and start the server.
4. DS Fault Message: The top level object cannot be an array will be logged.

[chanikag]

This is because we are converting the generated XML format to JSON. We have documented this in our docs https://docs.wso2.com/display/EI660/Using+JSON+with+Data+Services.

However I couldn't find that in the MI docs. @nilminiwso2 shall we include that in MI docs if it is not already done.