From b8303ed457cdd728de84bd404ea91b63c869cd5f Mon Sep 17 00:00:00 2001
From: Wanxin Hu <wanxin.hu.25@dartmouth.edu>
Date: Tue, 19 Jul 2022 08:23:49 -0400
Subject: [PATCH] fix the readonly issue with empty blocks

---
 example/tools/embed                  | 2 +-
 src/components/modules/api/blocks.ts | 7 ++++++-
 src/components/modules/renderer.ts   | 9 +++++++++
 3 files changed, 16 insertions(+), 2 deletions(-)

diff --git a/example/tools/embed b/example/tools/embed
index 35742f01a..27e578907 160000
--- a/example/tools/embed
+++ b/example/tools/embed
@@ -1 +1 @@
-Subproject commit 35742f01ae5875d442b145121d3c9b71b23aea56
+Subproject commit 27e5789079577c7dcaf9de8074d0979fc2e15203
diff --git a/src/components/modules/api/blocks.ts b/src/components/modules/api/blocks.ts
index 8d742c850..35294ab11 100644
--- a/src/components/modules/api/blocks.ts
+++ b/src/components/modules/api/blocks.ts
@@ -179,7 +179,12 @@ export default class BlocksAPI extends Module {
    * @param {OutputData} data — Saved Editor data
    */
   public render(data: OutputData): Promise<void> {
-    this.Editor.BlockManager.clear();
+    const needToAddDefaultBlock = !data.blocks.length;
+    this.Editor.BlockManager.clear(needToAddDefaultBlock);
+
+    if (needToAddDefaultBlock){
+      return Promise.resolve();
+    }
 
     return this.Editor.Renderer.render(data.blocks);
   }
diff --git a/src/components/modules/renderer.ts b/src/components/modules/renderer.ts
index 6f800069b..8befb2e0a 100644
--- a/src/components/modules/renderer.ts
+++ b/src/components/modules/renderer.ts
@@ -46,6 +46,15 @@ export default class Renderer extends Module {
    * @param {OutputBlockData[]} blocks - blocks to render
    */
   public async render(blocks: OutputBlockData[]): Promise<void> {
+
+    if (blocks.length === 0) {
+      blocks = [{
+          "data": {"text": ""},
+          "id": "WhateverXX",
+          "type": "paragraph",
+      }]
+  }
+  
     const chainData = blocks.map((block) => ({ function: (): Promise<void> => this.insertBlock(block) }));
 
     /**