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 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