epee: Don't set log file name when process path name isn't found
epee: Don't set log file name when process path name isn't found

If process path name isn't found, then leave log file name blank.

This also applies if a process name is found, but it's blank after
removing a trailing dot extension.

ranok/bitmonero,eiabea/bitmonero,eiabea/bitmonero,ranok/bitmonero,eiabea/bitmonero,ranok/bitmonero,eiabea/bitmonero,ranok/bitmonero,eiabea/bitmonero,ranok/bitmonero,ranok/bitmonero,eiabea/bitmonero