Do not mask interface errors with stubs. Just fail.

RCUSCC/RCUSCC/RCUSCC.py

@@ -252,17 +252,10 @@ class RCUSCC(Device):
         try:
             return self.pcc_node.get_child(["{}:{}".format(self.name_space_index, node)])
         except opcua.ua.uaerrors._auto.BadNoMatch:
-            self.error_stream("Could not find PCC node %s, using a dummy", node)
-
-            class DummyNode:
-                def get_value(self):
-                    pass
-
-                def set_value(self, val):
-                    pass
-
-            return DummyNode()
+            self.error_stream("Could not find PCC node %s", node)
 
+            # Contract with hardware is broken --- cannot recover
+            raise
 
     def _map_attributes(self):
         try: