web2py/web2py — pull request #180 by gi0baro (2013-08-23 11:21:49+00:00)
Title: Support querying for null values in mongoDB

This should be a very simple fix of issue 1641.
Please see:
https://code.google.com/p/web2py/issues/detail?id=1641
https://groups.google.com/forum/#!topic/web2py-developers/jDBEM-lbvsk