fix so that, even if there are no memcached servers, DoNotCache resul…

…ts are properly unwrapped

src/rez/utils/memcached.py

@@ -353,7 +353,10 @@ def wrapper(*nargs, **kwargs):
                     return result
         else:
             def wrapper(*nargs, **kwargs):
-                return func(*nargs, **kwargs)
+                result = func(*nargs, **kwargs)
+                if isinstance(result, DoNotCache):
+                    return result.result
+                return result
 
         def forget():
             """Forget entries in the cache.