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add note on return values when null is passed to a data transformer's transform() method

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Original file line number	Diff line number	Diff line change
@@ -97,6 +97,12 @@ for converting to and from the issue number and the ``Issue`` object::
`97`	`97`	`If you want a new issue to be created when an unknown number is entered, you`
`98`	`98`	can instantiate it rather than throwing the ``TransformationFailedException``.
`99`	`99`
	`100`	`+..note::`
	`101`	`+`
	`102`	+ When ``null`` is passed to the ``transform()`` method, your transformer
	`103`	`+ should return an equivalent value of the type it is transforming to (e.g.`
	`104`	`+ an empty string, 0 for integers or 0.0 for floats).`
	`105`	`+`
`100`	`106`	`Using the Transformer`
`101`	`107`	`---------------------`
`102`	`108`

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