Remove useless fallback case

My bad ;-)
Some fixes
Merge pull request #1012 from franckstauffer/master

Some small fixes
Fix numeric image dimensions edition in WYSIWYG mode of rich texts.
Enable to edit link properties in the WYSIWYG rich text editor.
[FIX] After editing the source of a WYSIWYG rich text editor, the related property were not flagged as modified.
Enable to edit image and video properties in the WYSIWYG rich text editor.