Github user prabhjyotsingh commented on the issue:
https://github.com/apache/zeppelin/pull/1184
@zjffdu have updated PR's description, what I meant was "this should result
in proper error message".
So, the original issue was with the RestTemplate that we are using which
throws HttpClientErrorException exception when a HTTP 4xx is received, and when
ever a session is queried which is either expired or does not exist livy throws
`"Session '10' not found."` with response code 404, and because of this
`HttpClientErrorException` proper error message was not shown on UI.
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