Only create NULL category columns where necessary
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Description
_From @shaycrk on September 20, 2017 16:46_
Presently (with the new imputation support), all categoricals will generate a NULL category column (so may create a number of columns with only zeros) -- in the future, we may want to clean this up by only creating this category where NULL values exist.
_Copied from original issue: dssg/architect#46_
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