Process.cmdline should trim unnecessary trailing characters about psutil HOT 6 CLOSED

Another problem:

>>> import psutil
>>> psutil.Process(2).cmdline
['']

When cmdline is not available we should return an empty list "[]" instead.

Both issues fixed as r71 .

I would suggest doing this with a list comprehension instead: 

    cmdline = [x for x in f.read().split('\x00')[:-1] if x]

This solves both problems in less code and less operations.

Updated csets after the SVN -> Mercurial migration: r71 == revision 38915f28fec1