[Doctrine][Bridge] EntityType: Allow empty result; default choices
value changed to null
#2868
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Bug fix: yes
Feature addition: no
Backwards compatibility break: no
Symfony2 tests pass: yes
References the following tickets: #2504
null
as default value for choices.null
as default value in __construct too.null
as default value for choices in EntityType.I squashed commits from PR #2504 as requested.