None/NULL don't work
Good point, this definitely looks like something that'll need fixing.  Let me look into it.
 Fixed in https://github.com/coleifer/peewee/commit/466d6d7c41d4f888d6c3db5e7de55785b2c41940

Check the test case for examples.

Stuffing a None into any field returns a False value when retrieved.  For example, setting a TextField to None returns '' (empty string), BooleanField returns False, etc.. 

Dunno if this intentional, (real NULL support would be nice, though IIRC django discourages it). If it is, this sentence in the docs is misleading: "Conversion between python and the database is handled transparently, including the proper handling of None/NULL." As a user of the dbapi directly, I expected storing a None to return a NULL.
