ckEditor injects an extraneous line-break (<br />) in empty fields

If you save any form that was a WYSIWYG field when editor = ckEditor, if the field is empty - the saved column has '<br />' added to it. This causes problems like "empty" help blocks in Profiles and Custom Field Sets.

Lobo's suggestion was to add a filter to the addWysiwyg() function which uses the same method Piotr has implemented for CRM-6224 to check whether an HTML formatted string has any content other than line or paragraph breaks. This would be called on save for any WYSIWYG field, and clean up these extraneous characters.