Address some MNMG issues in cython.cu#2224

Merged

rapids-bot[bot] merged 2 commits intorapidsai:branch-22.06from ChuckHastings:fix_2217

Apr 14, 2022

+39-21

Commits on Apr 13, 2022

weights can be empty on some GPUs and not others in MNMG. Missing else in renumber_helper
ChuckHastings
committed

Commits on Apr 14, 2022

add else for two other blocks of code
ChuckHastings
committed