zope.testbrowser fails badly when calling .contents on a new Browser instance

[Valentin Lab]

On a new instance of Browser (of zope.testbrowser), asking contents before open()ing an URL fails badly:

>>> browser = Browser()
>>> browser.contents
Traceback (most recent call last):
...
AttributeError: 'NoneType' object has no attribute 'tell'

The exception is not very clear, and it might not be the correct way to handle this case. Mechanize answers with "None".
We should just avoid trying to get further if we receive None and return None also.

I've joined a patch with a test.

[Valentin Lab (vaab)]

forgot the bug URL in the comments of the last patch

[Wolfgang Schnerring (wosc)]

I agree, browser.contents should simply return None in that case. Thanks for the patch, applied (with minor tweaks) in r103586.

[Tres Seaver (tseaver)]

Released with zope.testbrowser 3.7.0:

 http://pypi.python.org/pypi/zope.testbrowser/3.7.0