[Bug] Console error when caret events occur without a selectionRange

- Drag to create a multi block selection.
- Click somewhere else on the page outside the editor, to remove the browser-native text caret (but not remove the multi-block selection).
- With editorjs focused, press any key.
- The debugger console produces an error in src/components/modules/caret.ts. This is because there is no `selectRange` defined.

Resolution: https://github.com/raykyri/editor.js/commit/223b940be292828dff0dfd0869141c3ba9f03d32

Reproduce the multi-block selection and focus steps, then inspect src/components/modules/caret.ts where the console error occurs when no selectRange is defined. Confirm the caret event path handles this state without producing an error, and compare the referenced resolution commit for the expected behavior.

Written by the indexing model from the issue text.