sonata-project/SonataBlockBundle — pull request #44 by dbu (2013-01-16 19:53:19+00:00)
Title: Update Block/BlockLoaderInterface.php

If i understand it correctly, this is the semantics of the loader interface: if the block is not found, we return null rather than throw some exception. at least this is what the cmf loader does: https://github.com/symfony-cmf/BlockBundle/blob/master/Block/PHPCRBlockLoader.php#L41

/cc @elhornair