[Tooling][Feed Simulation] Exception thrown when Siddhi app is stopped while simulation is running

[pcnfernando]

Description:
When you stop a Siddhi app while a feed simulation is running, below exception get printed continuously in the web console.

Failed to load resource: the server responded with a status of 500 (Internal Server Error)
log4javascript.js:148 {"status":"INTERNAL_SERVER_ERROR","message":"Siddhi App \u0027ReceiveThroughHttp\u0027 is in faulty state."}
BrowserConsoleAppender.append @ log4javascript.js:148
simulation/feed:1 Failed to load resource: the server responded with a status of 500 (Internal Server Error)
log4javascript.js:148 {"status":"INTERNAL_SERVER_ERROR","message":"Siddhi App \u0027ReceiveThroughHttp\u0027 is in faulty state."}
BrowserConsoleAppender.append @ log4javascript.js:148
Appender.doAppend @ log4javascript.js:81
Logger.callAppenders @ log4javascript.js:64
Logger.log @ log4javascript.js:64
error @ log4javascript.js:68
(anonymous) @ feed_simulator.js:2240
error @ simulator-rest-client.js:296
c @ jquery-1.9.1.min.js:3
fireWith @ jquery-1.9.1.min.js:3
k @ jquery-1.9.1.min.js:5
r @ jquery-1.9.1.min.js:5
simulation/feed:1 Failed to load resource: the server responded with a status of 500 (Internal Server Error)
log4javascript.js:148 {"status":"INTERNAL_SERVER_ERROR","message":"Siddhi App \u0027ReceiveThroughHttp\u0027 is in faulty state."}

Affected Product Version:
5.1.2 RC1

[niveathika]

@pcnfernando I was unable to reproduce this in the 5.1.2-rc1 pack,

1. I save ReceiveThroughHTTP sample
2. Added a feed simulation for the specific sample
3. Started the siddhi app and simulation
4. Stopped siddhi app in the middle, the feed simulation stopped correctly with the warning printed
   

[pcnfernando]

Missed a point, have the Siddhi app with even a single templated placeholder.

[niveathika]

Seems this is only applicable when the siddhi app contains env variables