angular/angular.js — pull request #7290 by btford (2014-04-28 20:50:51+00:00)
Title: fix(ngSrc, ngSrcset, ngHref): only interpolate if all expressions are defined

**BREAKING CHANGE**

If `bar` is `undefined`, before `` yields
``. With this change, the binding will not set `src`.

If you want the old behavior, you can do this: ``.

The same applies for `srcset` and `href`.