Fixes #3992 and corner cases of inputColumnNames on FeaturizeText #4211
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Fixes #3992 , where FeaturizeText is used with an options object, but no inputColumnNames is provided, thus expecting the inputColumnName to be defaulted to the outputColumnName.
It also covers the corner cases where the user uses FeaturizeText with an options object along with a 'null' or an empty string as inputColumnNames.
Three different tests are provided to cover those 3 cases. It is verified that the text is featurized correctly and the features are saved in a column with the same name as the input column. They are all based on the TextFeaturizerWithWordFeatureExtractorTest, but without using a PredictionEngine because the output column hides the input column, and thus instead getting the rows of the dataview to verify their values.
A small fix to the documentation of FeaturizeText is added.