remove unnecessary assert. the length of results might be different from the...

remove unnecessary assert. the length of results might be different from the length of arguments, for example for delete since we are recursive

opcua/common/node.py

@@ -591,7 +591,8 @@ class Node:
         Delete node from address space
         """
         results = await delete_nodes(self.server, [self], recursive, delete_references)
-        _check_results(results)
+        for r in results:
+            r.check()
 
     def _fill_delete_reference_item(self, rdesc, bidirectional=False):
         ditem = ua.DeleteReferencesItem()