The nohup command only writes to nohup.out if the output is otherwise to the terminal. If you redirect the output of the command somewhere else – including /dev/null – that’s where it goes instead.
nohup command >/dev/null 2>&1
# doesn't create nohup.out
If you’re using nohup, that probably means you want to run the command in the background by putting another & on the end of the whole thing:
nohup command >/dev/null 2>&1 &
# runs in background, still doesn't create nohup.out, no error file create