Blocking error when inserting OS emoji

[fredck]

📝 Provide detailed reproduction steps (if any)

1. Have an empty editor (like the docs demo).
2. Paste the following (including space at the end):

I was missing this feature on multiple occasions and had to fallback to ancient WYSIWYG knowledge of "go to n-1 character and start typing from there and press delete to remove last character". 

1. Insert an emoji using the OS (ctrl+cmd+space on mac, win+. on windows).

✔️ Expected result

The emoji is inserted and no error is thrown.

❌ Actual result

The emoji is inserted and an error is thrown.

Following that, the editor is broken. For example "select all -> backspace" will not work.

📃 Other details

• OS: confirmed on mac and windows.

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[Reinmar]

It works on master already. Fixed by @niegowski in ckeditor/ckeditor5-utils#327.