shaneknapp commented on issue #25585: [SPARK-28701] fix the key error when 
looking in os.environ
URL: https://github.com/apache/spark/pull/25585#issuecomment-524946226
 
 
   @HyukjinKwon @srowen 
   
   it behooves us, when checking for env vars in non-prb builds, to always 
check for the key before referencing it in an `if` statement.  :)

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