Static listproperty is not stored in datastore if it does'nt have any
value.
So, I don't know how to get entities which have empty listproperty .

How can I get t1 by gql from follow example?
---------------------------------------------------------------------------------------

class TestList(db.Model):
    acl = db.ListProperty(int)

t = TestList(acl=[1,2,3])
t.put()

t1 = TestList(acl=[])
t1.put()

t2 = TestList(acl=[4,5])
t2.put()



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