Allow empty anchor tags (A-tag)

[Vlad]

CKEditor with disabled ACF cuts off empty A-tag which widely used to create a visual buttons.

Steps to reproduce:

1. Open ​http://ckeditor.com/demo#standard
2. Click 'Source' button.
3. Put this code into textarea:

<style> .btn {

background-image:url(http://example.com/button.png); background-repeat:no-repeat; background-position:top right; display:block; width:333px; height:80px;

} </style> <a class="btn" href="​http://example.com" target="_blank"></a>

4. Switch back to editor and then switch back to source code.
5. Expected result: A-tag will be there.
6. Actual result: There is no A-tag at all.

Please help to solve this issue!

[Piotrek Koszuliński]

Empty links have no semantic value and are invisible from algorithms operating on DOM. Therefore they are stripped and preserving them would create a lot of problems.