Description of problem:
'None' does not work as the second argument of gnome.help_display()

Version-Release number of selected component (if applicable):
gnome-python2-2.0.0-2

How reproducible:
Always

Steps to Reproduce:
1. yum install pybliographer from Fedora Extra stable repository
2. change line 'gnome.help_display ('pybliographer', '')' to 
   'gnome.help_display ('pybliographer', 'None')' in the file
   /usr/share/pybliographer/Pyblio/GnomeUI/Document.py
3. start pybliographic with the command 'pybliographic' in a terminal
4. Choose Help - Contents

Actual Results:  yelp starts but the page is not correct.

Expected Results:  yelp shows the Contents page.

Additional info:

See the discussions:
http://mail.gnome.org/archives/gnome-doc-list/2004-June/msg00038.html
http://mail.gnome.org/archives/gnome-doc-list/2004-June/msg00040.html

This bug is reported at bugzilla.gnome.org, and there is a fix already
in gnome CVS. 
See: http://bugzilla.gnome.org/show_bug.cgi?id=144976
A package update would be great.

See also:
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=126845