Fix unable to delete default value for a complex property

1) Created a property on VFC

Do not enter anything for the default values. It seems to take the empty values as the default.

2) Template formats it as

      properties:
        test_property:
        -

3) Delete the default value on assignment page , appears to delete , but then re -appears

Template formats again as:

      properties:
        test_property:
        - {           }