[BUG][iOS] Calling replaceText() on iOS throws Invalid argument(s): Result of JavaScript execution returned a null value. Use runJavascript when expecting a null return value.

[Kuroketsu]

Describe the bug
Calling replaceText() on iOS throws Unhandled Exception: Invalid argument(s): Result of JavaScript execution returned a null value. Use runJavascript when expecting a null return value.

To Reproduce
Steps to reproduce the behavior:

1. Copy code from demo sample app
2. run on iOS
3. See error

Unhandled Exception: Invalid argument(s): Result of JavaScript execution returned a `null` value. Use `runJavascript` when expecting a null return value.
#0      WebKitWebViewController.runJavaScriptReturningResult (package:webview_flutter_wkwebview/src/webkit_webview_controller.dart:481:7)
<asynchronous suspension>
#1      WebViewXController.callJsMethod (package:quill_html_editor/src/widgets/webviewx/src/controller/impl/mobile.dart:124:20)
<asynchronous suspension>
#2      QuillHtmlEditorState._replaceText (package:quill_html_editor/src/quill_editor_wrapper.dart:529:12)
<asynchronous suspension>
#3      QuillEditorController.replaceText (package:quill_html_editor/src/quill_editor_wrapper.dart:1416:12)
<asynchronous suspension>

Expected behavior
Should not throw an exception and replaceText() should work properly.

Smartphone (please complete the following information):

• Device: iPhone 16 Plus
• OS: iOS 18.0

Package version used:

• quill_html_editor: ^2.2.8

Flutter Doctor
Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel stable, 3.24.3, on macOS 15.0.1 24A348 darwin-arm64 (Rosetta), locale en-PH)
[✓] Android toolchain - develop for Android devices (Android SDK version 34.0.0)
[✓] Xcode - develop for iOS and macOS (Xcode 16.0)
[✓] Chrome - develop for the web
[✓] Android Studio (version 2024.2)
[✓] VS Code (version 1.80.1)
[✓] Connected device (5 available)
[✓] Network resources

Additional context
I think this issue is related to the callJsMethod of the webviewx_plus package as it uses runJavascriptReturningResult instead of the regular runJavaScript.
I found it on the stackoverflow:
https://stackoverflow.com/questions/76048861/flutter-runjavascriptreturningresult-returns

[Kuroketsu]

I resolved the issue on this pull request.
#218

I jast added an empty string return for the javascript method replaceSelection() so that it does not throw the exception.