guardian/frontend — pull request #3406 by ironsidevsquincy (2014-03-05 12:18:28+00:00)
Title: Add empty alt attribute if one doesn't exits, when upgrading images

cc: @kaelig

![1306491690_river_pole_vault_fail](https://f.cloud.github.com/assets/74132/2332872/25cfc4fc-a460-11e3-9e97-b56c658d6f46.gif)