Not required ObjectProperty with a required field throws errors on instantiation

[KeithTsui]

If I have something like this:

class A(JsonObject):
    field1 = StringProperty(required=True)

class B(JsonObject):
    a = ObjectProperty(A, default=None)

Then when I create an instance of B like b = B(), I will get an error:

Traceback (most recent call last):
  File "/Users/keith/molabs/movideo/tests/commons/api/views/test_mapper.py", line 160, in test_required
    b = B()
  File "/Users/keith/molabs/movideo/lib/jsonobject/base.py", line 229, in __init__
    d = value.default()
  File "/Users/keith/molabs/movideo/lib/jsonobject/properties.py", line 128, in <lambda>
    default = lambda self: self.item_type()
  File "/Users/keith/molabs/movideo/lib/jsonobject/base.py", line 232, in __init__
    self[key] = d
  File "/Users/keith/molabs/movideo/lib/jsonobject/base.py", line 296, in __setitem__
    wrapped, unwrapped = self.__unwrap(key, value)
  File "/Users/keith/molabs/movideo/lib/jsonobject/base.py", line 283, in __unwrap
    recursive=False,
  File "/Users/keith/molabs/movideo/lib/jsonobject/base_properties.py", line 113, in validate
    'Property {0} is required.'.format(self.name)
BadValueError: Property field1 is required.

If I set the default of the item to be None, it seems to work. Why shouldn't an object just have a default of None?

[raynaya]

This is a bug. If you have an object A which is optional and resides inside Object B. Then you cant have required fields inside A.

When A is not present inside B, it gives error for the scalar required properties of A. Should not be the case imo.