zjffdu opened a new pull request #3701: [ZEPPELIN-4698]. empty env is passed to spark interpreter URL: https://github.com/apache/zeppelin/pull/3701 ### What is this PR for? This PR just filter the empty env in SparkInterpreterLauncher, only pass non-empty env to spark interpreter. Otherwise PySparkInterpreter will fail to launch due to invalid `SPARK_HOME` ### What type of PR is it? [Bug Fix ] ### Todos * [ ] - Task ### What is the Jira issue? * https://issues.apache.org/jira/browse/ZEPPELIN-4698 ### How should this be tested? * Unit test is added ### Screenshots (if appropriate) ### Questions: * Does the licenses files need update? No * Is there breaking changes for older versions? No * Does this needs documentation? No
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