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Allowed to return null for query_builder

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Original file line number	Diff line number	Diff line change
`@@ -202,9 +202,10 @@ query_builder`
`202`	`202`	`Allows you to create a custom query for your choices. See`
`203`	`203`	:ref:`ref-form-entity-query-builder` for an example.
`204`	`204`
`205`		-The value of this option can either be a ``QueryBuilder`` object ora Closure.
	`205`	+The value of this option can either be a ``QueryBuilder`` object,a Closure or ``null``.
`206`	`206`	When using a Closure, you will be passed the ``EntityRepository`` of the entity
`207`		-as the only argument and should return a ``QueryBuilder``.
	`207`	+as the only argument and should return a ``QueryBuilder``.
	`208`	+If you'd like to display a list of empty entries, you can return ``null`` in the closure.
`208`	`209`
`209`	`210`	`Overridden Options`
`210`	`211`	`------------------`

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