Avoid potential TypeErrors using LazyInitialise

lib/tfw/decorators/lazy_initialise.py

@@ -13,7 +13,7 @@ class LazyInitialise:
 
     def __get__(self, instance, owner):
         if instance is None:
-            raise TypeError('Cannot get object property from class!')
+            return self  # avoids potential __new__ TypeError
         value = self.func(instance)
         setattr(instance, self.func.__name__, value)
         return value