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[symfony#2397] Adding more empty_data details from previous changes that were removed when merging into 2.1

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Original file line number	Diff line number	Diff line change
`@@ -6,6 +6,17 @@ empty_data`
`6`	`6`	This option determines what value the field will return when the ``empty_value``
`7`	`7`	`choice is selected.`
`8`	`8`
	`9`	`+The true default value of this option depends on the field options:`
	`10`	`+`
	`11`	+* If ``compound`` is ``true`` and ``data_class`` is set, then ``new $data_class()``;
	`12`	+* If ``compound`` is ``true`` and no ``data_class`` is set, then ``array()``;
	`13`	+* If ``compound`` is ``false``, then ``null``.
	`14`	`+`
	`15`	`+.. tip::`
	`16`	`+`
	`17`	+ The ``compound`` option is set to ``true`` when the field actually represents
	`18`	`+ a collection of fields (e.g. a form of fields).`
	`19`	`+`
`9`	`20`	For example, if you want the ``gender`` field to be set to ``null`` when no
`10`	`21`	`value is selected, you can do it like this:`
`11`	`22`

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