I can confirm this error from  a fresh installed zeitgeist via PPA: 
I have Firefox installed.

"AttributeError: 'NoneType' object has no attribute 'execute'" if firefox is 
not installed
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Status in Zeitgeist Engine: New

Bug description:
I get this Traceback if firefox is not installed (a history db is not found):

DEBUG:root:Updating database with new Firefox History items
Traceback (most recent call last):
  File "/home/markus/zeitgeist/trunk/zeitgeist/../zeitgeist-datahub", line 111, 
in _update_db_async
    for num, item in enumerate(self._sources_queue[0].get_items()):
 line 107, in _wrapper
    for n, i in enumerate(self.get_items_uncached()):
 line 159, in get_items_uncached
    history = self.cursor.execute(
AttributeError: 'NoneType' object has no attribute 'execute'

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