anchor tag <a> doesn't work without href because of unsafe: link (IE 8 and below)

[dai-shi]

For IE8 and below, there is a special care in htmlAnchorDirective like the following:

if (msid <= 8) {
  if (!attr.href && !attr.name) {
    attr.$set('href', '');
  }
 ...

The change 9532234 is troublesome as it marks the href='' to be unsafe.

This used to work with angular-1.0.2.

Thanks.