setup.py always install nautilus-bzr

[Igor Vlasenko]

the code in setup.py is incorrect:
            cmd = os.popen('pkg-config --variable=pythondir nautilus-python', 'r')
            res = cmd.readline().strip()
            ret = cmd.close()
            if ret is None:
                dest = res[5:]
                files.append((dest, ['nautilus-bzr.py']))
it seems to be always true. at least res should be also tested.
оn build host there is no nautilus-python:
[builder@breeze bzr-gtk-0.95.0]$ pkg-config --variable=pythondir nautilus-python
[builder@breeze bzr-gtk-0.95.0]$ echo $?
1
but setup.py installs nautilus-bzr.py:
It causes rpm to autogenerate dependency
bzr-gtk: Depends: pythonXX(nautilus)
which is unmet dependency so the package is not installable.