Error in dialog box when trying to replace found text with empty block.

[Artur Delura]

Browsers: All

1. Open sample ​http://presets.ckeditor.dev/4.4.1/full-all/ckeditor/samples/replacebyclass.html.
2. Select sentence: Apollo 11 was in first paragraph.
3. Open find dialog.
4. Click find button.
5. In replace tab click 'Replace'.
6. Click close.

Actual result: There is an error in console: Uncaught TypeError: Cannot read property 'type' of null ckeditor.js:139

Plase note: similar to #11423

[Jakub Ś]

Problem can be reproduced from CKEditor 3.0 in every browser. In versions before 3.6.1 you need to write selected text into find dialog but you will get same result.

Error:
Message: TypeError: startNode is null
Line: 1633
URI: /ckeditor4/core/dom/range.js

[kkrzton]

It's basically a problem when replacing text (with empty text) which starts in one node and ends in another or text containing more than one node. Confirmed also in 4.5.6 on Chrome 47.0.2526.73 (Ubuntu).

Uncaught TypeError: Cannot read property 'type' of null          ckeditor.js:144