Github user mindprince commented on the pull request:
https://github.com/apache/incubator-zeppelin/pull/259#issuecomment-135140040
To check the effect of this PR:
```
$ curl -i -d '{}' -X PUT localhost:8080/api/interpreter/setting/asdf
```
Before:
```
HTTP/1.1 500 Server Error
Access-Control-Allow-Origin:
Access-Control-Allow-Credentials: true
Access-Control-Allow-Headers: authorization,Content-Type
Access-Control-Allow-Methods: POST, GET, OPTIONS, PUT, HEAD, DELETE
Date: Wednesday, August 26, 2015 11:59:00 AM PDT
Cache-Control: must-revalidate,no-cache,no-store
Content-Type: text/html;charset=ISO-8859-1
Content-Length: 1301
Server: Jetty(8.1.14.v20131031)
<html>
<head>
<meta http-equiv="Content-Type" content="text/html;charset=ISO-8859-1"/>
<title>Error 500 Server Error</title>
</head>
<body>
<h2>HTTP ERROR: 500</h2>
<p>Problem accessing /api/interpreter/setting/asdf. Reason:
<pre> Server Error</pre></p>
<hr /><i><small>Powered by Jetty://</small></i>
</body>
</html>
```
After:
```
HTTP/1.1 404 Not Found
Access-Control-Allow-Origin:
Access-Control-Allow-Credentials: true
Access-Control-Allow-Headers: authorization,Content-Type
Access-Control-Allow-Methods: POST, GET, OPTIONS, PUT, HEAD, DELETE
Date: Wednesday, August 26, 2015 11:54:29 AM PDT
Content-Type: application/json
Date: Wed, 26 Aug 2015 18:54:29 GMT
Content-Length: 86
Server: Jetty(8.1.14.v20131031)
{"status":"NOT_FOUND","message":"Interpreter setting id asdf not
found","body":"asdf"}
```
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