Nelson Costa e1f20ddda2 [ZEPPELIN-2699] Helium REST API bug-fixes. Also updated documentation ... ### What is this PR for? Fixing bug on enabling Helium plugins (artifact is empty, not null) when sending curl command. After noticing out-of-date documentation, I updated it Also noticed issues on missing try/catch expressions and missing info messages on enable/disable packages. ### What type of PR is it? [Bug Fix | Documentation | Refactoring] ### What is the Jira issue? * https://issues.apache.org/jira/browse/ZEPPELIN-2699 ### How should this be tested? Run "curl -X POST http://localhost:8080/api/helium/enable/{packageName}" Check that the package gets enabled ### Questions: * Does the licenses files need update? N * Is there breaking changes for older versions? N * Does this needs documentation? Y (Done) Author: Nelson Costa <nelson.costa85@gmail.com> Closes #2446 from necosta/zeppelin2699 and squashes the following commits: 473f9b43 [Nelson Costa] [ZEPPELIN-2699] Fixed initialization issue 45b77513 [Nelson Costa] [ZEPPELIN-2699] More corrections c8230218 [Nelson Costa] [ZEPPELIN-2699] Bug-fix on gathering package info 2b1ff8ae [Nelson Costa] [ZEPPELIN-2699] Changes after code review a71b9fb9 [Nelson Costa] [ZEPPELIN-2699] Changes after code-review 5d179218 [Nelson Costa] [ZEPPELIN-2699] Helium REST API bug-fixes. Also updated documentation		2017-07-22 00:24:20 +09:00
..
configuration.md	[ZEPPELIN-2596] Improving documentation page	2017-06-23 17:44:13 +09:00
credential.md	[ZEPPELIN-2596] Improving documentation page	2017-06-23 17:44:13 +09:00
helium.md	[ZEPPELIN-2699] Helium REST API bug-fixes. Also updated documentation	2017-07-22 00:24:20 +09:00
interpreter.md	[ZEPPELIN-2714] Soft-code Spark UI button visualization	2017-07-09 00:43:54 -07:00
notebook.md	[ZEPPELIN-2596] Improving documentation page	2017-06-23 17:44:13 +09:00
notebook_repository.md	[ZEPPELIN-2596] Improving documentation page	2017-06-23 17:44:13 +09:00
zeppelin_server.md	[ZEPPELIN-2596] Improving documentation page	2017-06-23 17:44:13 +09:00