[IE10] IndexSizeError while aborting image upload via undo/redo

[kkrzton]

Steps to reproduce

1. Go to ​http://tests.ckeditor.dev:1030/tests/plugins/uploadwidget/manual/image#child.
2. Drag and drop image.
3. Click undo while image is still uploading.
4. Click redo (image will not show as upload was aborted).
5. Drag and drop image.
6. Click undo while image is still uploading.
7. Click redo.

Expected result

Nothing happens as image upload is aborted. Redo cannot be clicked again.

Actual result

Error is thrown while redoing. Redo is active and can be clicked multiple times (throwing error every time).

SCRIPT5022: IndexSizeError 
ckeditor.js, line 430 character 258

Other details (browser, OS, CKEditor version, installed plugins)

IE10, CKEditor 4.6.2.

[kkrzton]

Similar to #14844.