add None node

none_constant_node.py

@@ -0,0 +1,23 @@
+class NoneConstantNode:
+    @classmethod
+    def INPUT_TYPES(cls):
+        return {
+            "required": {},
+            "optional": {}
+        }
+    
+    RETURN_TYPES = ("*",)
+    RETURN_NAMES = ("value",)
+    FUNCTION = "get_none"
+    CATEGORY = "utils"
+    
+    def get_none(self):
+        return (None,)
+
+NODE_CLASS_MAPPINGS = {
+    "NoneConstant": NoneConstantNode
+}
+
+NODE_DISPLAY_NAME_MAPPINGS = {
+    "NoneConstant": "None Constant"
+}