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oxygen311 cd16547cbf [ZEPPELIN-3687] Fix IndexError in python interpreter with empty input 
### What is this PR for?
If input of python or pyspark interpreter is empty (contains only comments), it will fail with `IndexError` from `zeppelin_python.py`.

### What type of PR is it?
Bug Fix

### What is the Jira issue?
[ZEPPELIN-3687](https://issues.apache.org/jira/projects/ZEPPELIN/issues/ZEPPELIN-3687)

### Screenshots
## Before:
![screen-shot-2018-08-05-at-23 29 34](https://user-images.githubusercontent.com/16215034/43775282-d1274caa-9a54-11e8-9c6c-3b882f96cf7e.jpg)
![screen-shot-2018-08-07-at-11 48 10](https://user-images.githubusercontent.com/16215034/43775285-d385ad2a-9a54-11e8-9a14-aa0080cc5824.jpg)

## After:
![screen-shot-2018-08-07-at-15 11 452](https://user-images.githubusercontent.com/16215034/43775306-e17acf28-9a54-11e8-8378-9b6a8b1c817c.jpg)
![screen-shot-2018-08-07-at-15 11 45](https://user-images.githubusercontent.com/16215034/43775313-e51f81c8-9a54-11e8-829f-d2aba1cc9613.jpg)

### Questions:
* Does the licenses files need update? No
* Is there breaking changes for older versions? No
* Does this needs documentation? No

Author: oxygen311 <alex39-09@mail.ru>
Author: Alexey <alex39-09@mail.ru>

Closes #3115 from oxygen311/DW-17854 and squashes the following commits:

54004b098 [oxygen311] Fix tests
ad8d07f5e [Alexey] Add test for empty input
5d0fdd296 [oxygen311] Fix IndexError in python interpreter
2018-08-14 10:59:43 +08:00
..
main [ZEPPELIN-3687] Fix IndexError in python interpreter with empty input 2018-08-14 10:59:43 +08:00
test [ZEPPELIN-3687] Fix IndexError in python interpreter with empty input 2018-08-14 10:59:43 +08:00