Removed need for pid_exists() check in get_process_info - looks like sysctl() actually succeeds in some cases when the process has gone away, but returns a length of 0 for the amount of data copied. If this happens we raise NoSuchProcess since that seems to be the only scenario where that can occur.
Removed need for pid_exists() check in get_process_info - looks like sysctl()
actually succeeds in some cases when the process has gone away, but returns a
length of 0 for the amount of data copied. If this happens we raise
NoSuchProcess since that seems to be the only scenario where that can occur.

ztop/psutil,ztop/psutil,ztop/psutil,ztop/psutil