integrated_image formtype is broken in 0.7

Description

Steps to reproduce

  • Go to /admin/channel/new

  • Result: Exception

I expect the merge of to be the reason, but I am not sure (version 0.6 does not have this problem). Maybe it is because Symfony 2.8 needs the FQCN (https://github.com/symfony/symfony/blob/2.8/UPGRADE-2.8.md#form).

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Fixed

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