[twill] Bug with find in 0.8

[Peri Cumali]

For Twill 0.8 I can use find successfully from the shell, but I am 
getting errors if I use it from a python script.

For example I can do this fine from Twill:

go www.google.com
find google

Running the same from a python script (e.g. test.py) throws the 
following error

Traceback (most recent call last):
  File "test.py", line 7, in ?
    find("google")
  File 
"/Library/Python/2.3/site-packages/twill-0.8-py2.3.egg/twill/commands.py", 
line 183, in find
    global_dict, local_dict = get_twill_glocals()
  File 
"/Library/Python/2.3/site-packages/twill-0.8-py2.3.egg/twill/namespaces.py", 
line 45, in get_twill_glocals
    assert len(_local_dict_stack) >= 1, "must create a local namespace!"
AssertionError: must create a local namespace!

If I swap out the commands.pyin the site packages folder with the 0.7.4 
version the error goes away.

Thanks!

Peri