avalanche123/AvalancheImagineBundle — pull request #121 by ChubV (2013-02-16 15:56:33+00:00)
Title: Return null when original file doesn't exist

It is hard to manage images that are optional.
So is not it better to return null when original file doesn't exist.
It allows us to write something like `{{ entity.getImage | apply_filter('some') | default('placeholder.img') }}`.