Initialize any_nan_ property of LinearTreeLearner (#3709)
Initialize any_nan_ property of LinearTreeLearner (#3709)


microsoft/LightGBM,henry0312/LightGBM,microsoft/LightGBM,microsoft/LightGBM,microsoft/LightGBM,henry0312/LightGBM,henry0312/LightGBM,henry0312/LightGBM,henry0312/LightGBM,microsoft/LightGBM