Github user yanboliang commented on the issue:
    @BryanCutler Thanks for working on this. I'm a bit worried that if users 
set ```weightCol = None``` for Python means he would like to set ```weightCol = 
null``` for Scala. 
    The common scenario would be:
    LogisticRegression(maxIter=5, regParam=0.0, weightCol="weight")
    LogisticRegression(maxIter=5, regParam=0.0, weightCol="")    
    LogisticRegression(maxIter=5, regParam=0.0)  
    And users are unlikely to write the following code:
    LogisticRegression(maxIter=5, regParam=0.0, weightCol=None)    
    However, it users actually do this, I'm more likely to consider that he 
will forcibly specify ```weightCol``` as ```null```. So I vote to not change 
this behavior. Thanks.
    cc @srowen @MLnick @jkbradley 

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