nanshe/nanshe/registration.py: Change fill value for the result to be some form of 0.
nanshe/nanshe/registration.py: Change fill value for the result to be some form of 0.

nanshe-org/nanshe,DudLab/nanshe,jakirkham/nanshe,nanshe-org/nanshe,DudLab/nanshe,jakirkham/nanshe