object_info now returns if node is an output_node or not.

server.py

@@ -272,6 +272,11 @@ class PromptServer():
             info['display_name'] = nodes.NODE_DISPLAY_NAME_MAPPINGS[node_class] if node_class in nodes.NODE_DISPLAY_NAME_MAPPINGS.keys() else node_class
             info['description'] = ''
             info['category'] = 'sd'
+            if hasattr(obj_class, 'OUTPUT_NODE') and obj_class.OUTPUT_NODE == True:
+                info['output_node'] = True
+            else:
+                info['output_node'] = False
+
             if hasattr(obj_class, 'CATEGORY'):
                 info['category'] = obj_class.CATEGORY
             return info