Pasting into selection made of multiple table cells crashes the editor

[oleq]

📝 Provide detailed reproduction steps (if any)

1. Copy some text.
2. Create a multi-cell selection using your mouse.
3. Ctrl+V

✔️ Expected result

The text should be pasted, probably into the last cell in the seleciton.

❌ Actual result

Editor crashes.

📃 Other details

master

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[Reinmar]

Fixed with ckeditor/ckeditor5-engine#1830.