[SQLObject] default empty dict for picklecol

[Daniel F. <fet...@go...>]

When using a PickleCol with default={ } the behaviour is not exactly
what I would expect:

######################################################################
from sqlobject import *
sqlhub.processConnection = connectionForURI( 'sqlite:///:memory:', debug=True )
class t( SQLObject ):
    x = PickleCol( default={} )
t.createTable( )
row = t( )
print row.x   # this will print None
######################################################################

Having a non-empty dict works as expected though. I had a feeling it
was related to mutable keyword argument values and the associated
problems, but the same problem is there with an empty tuple which is
certainly unmutable.

Is this a bug or a feature?

Cheers,
Daniel

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