Required Rich Text fields that are blank do not cause an error

Our HtmlValidator does not consider non-breaking spaces as whitespace, which makes empty 'looking' required Rich Text fields - filled with for example a couple of <p> </p> - being validated as non-empty.

Also, a required Rich Text fields with no characters in it, but with one of the following elements should be considered valid: img, object, embed, form, applet. Currently only an img element is supported.