ng-bind-html is not watching bound value correctly

[petebacondarwin]

If a the ng-bind-html value is bound to {{a.b}} and then b is deleted from a (either by the delete operator or by changing a) then the binding does not update correctly: http://jsfiddle.net/qYpcA/5/

From looking at the code the ng-bind-html is the only one that does not wrap the link function in a call to ngDirective.

[IgorMinar]

we don't use ngDirective there because we need to inject $sanitize service. the real problem was that we called html(content) if the content was truthy, which was a bug.