Make closures dict optional
Make closures dict optional

jriehl/numba,numba/numba,stuartarchibald/numba,seibert/numba,pombredanne/numba,GaZ3ll3/numba,numba/numba,pitrou/numba,cpcloud/numba,stonebig/numba,jriehl/numba,stefanseefeld/numba,shiquanwang/numba,cpcloud/numba,pombredanne/numba,gmarkall/numba,jriehl/numba,stefanseefeld/numba,GaZ3ll3/numba,gmarkall/numba,gdementen/numba,IntelLabs/numba,cpcloud/numba,ssarangi/numba,shiquanwang/numba,pombredanne/numba,pitrou/numba,GaZ3ll3/numba,ssarangi/numba,numba/numba,sklam/numba,ssarangi/numba,pombredanne/numba,GaZ3ll3/numba,pombredanne/numba,ssarangi/numba,seibert/numba,jriehl/numba,stefanseefeld/numba,sklam/numba,IntelLabs/numba,cpcloud/numba,gdementen/numba,sklam/numba,seibert/numba,gdementen/numba,sklam/numba,cpcloud/numba,IntelLabs/numba,seibert/numba,gmarkall/numba,gdementen/numba,stonebig/numba,gmarkall/numba,IntelLabs/numba,pitrou/numba,stonebig/numba,shiquanwang/numba,IntelLabs/numba,stuartarchibald/numba,gdementen/numba,GaZ3ll3/numba,numba/numba,ssarangi/numba,stefanseefeld/numba,stuartarchibald/numba,stonebig/numba,stuartarchibald/numba,seibert/numba,stonebig/numba,stefanseefeld/numba,sklam/numba,pitrou/numba,stuartarchibald/numba,pitrou/numba,numba/numba,jriehl/numba,gmarkall/numba