Returning “None” instead default Value for new fields

[rristow]

If a new field is introduced in the schema, dexterity correctly sets default value for a new object.
On the other side, if I try to get the content of the field for an existing item, it returns the value “None”.
(or if the value of the field is deleted via widget)
This can cause many errors in 3-part code if a string or integer is expected instead of “None”.

Steps to reproduce:

• Add some dexterity object “obj1”
• Add a String field “newfield1” in the schema with the default value = “ ”
• Verify with the code the value of the field: “obj1.newfield1”
• The value is None