remove unnecessary statement

src/caoscrawler/sync_graph.py

@@ -341,7 +341,7 @@ class SyncGraph():
                 node, self.backward_references_backref[id(node)])
         node.identifiable = identifiable
         equivalent_se = self.get_equivalent(node)
-        if equivalent_se is not None and equivalent_se is not node:
+        if equivalent_se is not None:
             self._merge_into(node, equivalent_se)
         else:
             if node.identifiable.get_representation() in self._identifiable_look_up: