501 response for inline prototyped APIs

[akila95fernando]

Description:

When deploying a prototyped API with inline script mediator.
It always returns 501.

Steps to reproduce:

Update wso2am-2.6.0 to level 78
Create an API
In the Implement tab , select prototyped api and select inline implementation.
Edit the response( uncomment )
Deploy the API
Invoke the APi
API returns 501

Affected Product Version:

APIM-2.6.0