Silently drops errors in subforms - partially fixed

It now doesn't silently drop errors, however the way errors are reported isn't quite correct. For example if a subform's title is left blank, both the subform's title and the main form's title will be highlighted. The reason is probably because the class or id of those two fields is the same. A possible solution may be to rename parts of the subform permanently (although this can cause javascript to fail).