[Bug] When using Editor in new projects a Range Error is thrown if no header is passed but a footer is passed.

[MayurSMahajan]

Bug Description

When using AppFlowyEditor as a package in my Codeblock project. I noticed that a range error occurs when I initialize my Editor as follows:

final editorState = EditorState(
  document: Document(root: pageNode(children: [codeBlockNode()])),
);
//...
Widget build(BuildContext context) {
    return AppFlowyEditor(
      editorState: editorState,
      autoFocus: true,
      characterShortcutEvents: characterShortcutEvents,
      commandShortcutEvents: commandShortcutEvents,
      blockComponentBuilders: blockComponentBuilders,
      footer: const SizedBox(height: 200),
    );
  }

How to Reproduce

I am not sure how one can reproduce this error.

1. Initialize an AppFlowyEditor instance with only a footer and no header.
2. Try running the project.

Expected Behavior

No range error should occur

Operating System

Windows11

AppFlowy Editor Version(s)

1.4.4

Screenshots

Additional Context

No response