BUG: Copy categorical codes if empty (fixes #18051)#18436

Merged

jreback merged 1 commit intopandas-dev:masterfrom topper-123:catDtype_copy_nan_codes

Nov 23, 2017

+16-1

Commits on Nov 22, 2017

BUG: Copy categorical codes if empty (fixes pandas-dev#18051 )
tp
committed