Github user HyukjinKwon commented on the issue:

    https://github.com/apache/spark/pull/20841
  
    I think we should better match Python side behaviour to Scala side in 
general and throw a better exception if possible. I think the application conf 
was done like that because there wasn't `_NoValue` concept at that time. Both 
sides were not the same already .. 
    
    BTW, could I ask to fix it separately please? I actually know several 
places that we might have to consider `_NoValue` .


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