Fix _has_[gs]etter in Auto KWArgs

Need to check if f[gs]et is not None.

python_utils/kwargs_init.py

@@ -18,14 +18,14 @@ class AutoKWArgs(object):
         """Check if property has getter."""
         class_attribute = getattr(type(self), property_key, None)
         if isinstance(class_attribute, property):
-            return class_attribute.fget is None
+            return class_attribute.fget is not None
         return False
 
     def _has_setter(self, property_key):
         """Check if property has setter."""
         class_attribute = getattr(type(self), property_key, None)
         if isinstance(class_attribute, property):
-            return class_attribute.fset is None
+            return class_attribute.fset is not None
         return False
 
     @property