[FIX] preprocess: Fix RemoveNaNClasses / Use existing HasClass #2450
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Issue
SklLearner methods do not work on SqlTable data because of the RemoveNaNClasses preprocessor.
Description of changes
Use an existing (more general) implementation of the RemoveNaNClasses preprocessor - the HasClass filter.
Why do we even have both (functionality looks exactly the same)?
Before merging, we should check whether the RemoveNaNClasses preprocessor can be removed completely and HasClass filter used in its place.
Includes