fix color getattr error

Author: Licini

CHANGELOG.md

@@ -11,6 +11,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Changed
 
+* Fixed `Color.__get___` AttributeError.
+
 ### Removed
 
 

src/compas/colors/color.py

@@ -276,7 +276,7 @@ def __set_name__(self, owner, name):
         self.private_name = '_' + name
 
     def __get__(self, obj, otype=None):
-        return getattr(obj, self.private_name) or self
+        return getattr(obj, self.private_name, None) or self
 
     def __set__(self, obj, value):
         if not obj: