Fix BaseModel to initialize from a dictionary via __init__ instead of setattr

This solves an exception on instantiating an empty model with fields that are not optional

Author: dmach

osc/util/models.py

@@ -312,10 +312,7 @@ def get(self, obj):
         # if this is a model field, convert dict to a model instance
         if self.is_model and isinstance(default, dict):
             cls = self.origin_type
-            new_value = cls()  # pylint: disable=not-callable
-            for k, v in default.items():
-                setattr(new_value, k, v)
-            default = new_value
+            default = cls(**default)
 
         obj._defaults[self.name] = default
         return default