[web2py] Error creating a grid when no user is logged in

[Liam]

Hi all,

When creating a grid and no user is logged in, I get an AttributeError: 
'NoneType' object has no attribute 'user'.

This can be recreated using vanilla web2py 2.0.2:
$ python web2py.py -S welcome -M
...

In [1]: SQLFORM.grid(db.auth_user)
...
   1660             if (args != request.args and user_signature and \
   1661                     not URL.verify(request,user_signature=
user_signature)) or \
-> 1662                     (not session.auth.user and \
   1663                          ('edit' in request.args or \
   1664                               'create' in request.args or \

AttributeError: 'NoneType' object has no attribute 'user'

In [2]: from gluon import current

In [3]: current.session
Out[3]: <Storage {'auth': None}>

I think that the grid function is using the wrong check to see if a user is 
logged in. The relevant line is
not session.auth.user

Perhaps it should be?
not session.auth

On another much less important note, I thought the correct Pythonic way to 
check for None is:
session.auth is None
;)

Cheers,
Liam

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