callback: use "IsEmpty()" instead of an explicit NULL check
callback: use "IsEmpty()" instead of an explicit NULL check

Using the V8 API directly seems like a good idea. *shrug*

node-ffi/node-ffi,Icenium/node-ffi,craigcomstocks/node-ffi,unbornchikken/node-ffi,skoky/node-ffi,node-ffi/node-ffi,pmuellr/node-ffi,unrealsolver/node-ffi,unbornchikken/node-ffi,pmuellr/node-ffi,craigcomstocks/node-ffi,skoky/node-ffi,pmuellr/node-ffi,lzpfmh/node-ffi,skoky/node-ffi,unbornchikken/node-ffi,skoky/node-ffi,unrealsolver/node-ffi,paulcbetts/node-ffi,Icenium/node-ffi,Icenium/node-ffi,paulcbetts/node-ffi,lzpfmh/node-ffi,paulcbetts/node-ffi,Icenium/node-ffi,craigcomstocks/node-ffi,node-ffi/node-ffi,lzpfmh/node-ffi,paulcbetts/node-ffi,pmuellr/node-ffi,lzpfmh/node-ffi,node-ffi/node-ffi,craigcomstocks/node-ffi,unrealsolver/node-ffi,unbornchikken/node-ffi,unrealsolver/node-ffi