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Always set KNIT_LANG, even if envvars passed in
OK, reasonable.
If it's not set, things fail in the application master here, as a null reference error occurs on this line: https://github.com/dask/knit/blob/master/knit_jvm/src/main/scala/io/continuum/knit/ApplicationMaster.scala#L155. As such, I'm a bit confused why this test passed before. Perhaps changes to the environment variables persisted? I don't really have time right now to debug the tests, but this fix is valid.