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[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: 54004b0 [oxygen311] Fix tests ad8d07f [Alexey] Add test for empty input 5d0fdd2 [oxygen311] Fix IndexError in python interpreter
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