make sure notes node exists like we do for invocation nodes

invokeai/frontend/web/src/features/nodes/components/flow/nodes/Notes/NotesNode.tsx

@@ -1,14 +1,16 @@
 import { Box, Flex, Textarea } from '@invoke-ai/ui-library';
+import { createSelector } from '@reduxjs/toolkit';
 import type { Node, NodeProps } from '@xyflow/react';
-import { useAppDispatch } from 'app/store/storeHooks';
+import { useAppDispatch, useAppSelector } from 'app/store/storeHooks';
 import NodeCollapseButton from 'features/nodes/components/flow/nodes/common/NodeCollapseButton';
 import NodeTitle from 'features/nodes/components/flow/nodes/common/NodeTitle';
 import NodeWrapper from 'features/nodes/components/flow/nodes/common/NodeWrapper';
 import { notesNodeValueChanged } from 'features/nodes/store/nodesSlice';
+import { selectNodes } from 'features/nodes/store/selectors';
 import { NO_DRAG_CLASS, NO_PAN_CLASS } from 'features/nodes/types/constants';
 import type { NotesNodeData } from 'features/nodes/types/invocation';
 import type { ChangeEvent } from 'react';
-import { memo, useCallback } from 'react';
+import { memo, useCallback, useMemo } from 'react';
 
 const NotesNode = (props: NodeProps<Node<NotesNodeData>>) => {
   const { id: nodeId, data, selected } = props;
@@ -21,6 +23,16 @@ const NotesNode = (props: NodeProps<Node<NotesNodeData>>) => {
     [dispatch, nodeId]
   );
 
+  const selectNodeExists = useMemo(
+    () => createSelector(selectNodes, (nodes) => Boolean(nodes.find((n) => n.id === nodeId))),
+    [nodeId]
+  );
+  const nodeExists = useAppSelector(selectNodeExists);
+
+  if (!nodeExists) {
+    return null;
+  }
+
   return (
     <NodeWrapper nodeId={nodeId} selected={selected}>
       <Flex