Replace is_property by a more generic solution that's able to retriev…

…e property objects

thingy.py

@@ -63,8 +63,12 @@ def __new__(cls, name, bases, attrs):
         return klass
 
 
-def is_property(attr, instance):
-    return any(attr in cls.__dict__ for cls in type(instance).__mro__)
+def getclassattr(instance, attr):
+    for cls in type(instance).mro():
+        try:
+            return cls.__dict__[attr]
+        except KeyError:
+            pass
 
 
 @six.add_metaclass(ThingyMetaClass)
@@ -85,7 +89,7 @@ def __getattribute__(self, attr):
         try:
             return object.__getattribute__(self, attr)
         except AttributeError:
-            if not is_property(attr, self) and self._silent:
+            if type(getclassattr(self, attr)) is not property and self._silent:
                 return None
             raise