Hi,

I implemented the fix from #14465 into the codebase of my Symfony 2.7.0-BETA1 based appication. Now, the non required filter form choice fields work again an do not provoke form errors, when they are empty.

But in the same time, all my required choice fields (representing non nullable database columns) do not validate anymore, when I submit them empty. Insteat I get an SQL error about the missing values for the non nullable fields. Removing the fix again resolves this.

See also my comment on the fix itself: #14465 (comment)