NULL source values are not handled correctly
currently, for example
results into a message
No converter found which can be used to convert from "string" to "array"
which is at least incorrect for the source type, IMO the converter should return NULL then, too (i.e. leave the property untouched).
I found this change here being relevant for this, https://review.typo3.org/#/c/1895/3/Classes/Property/PropertyMapper.php There, the $source is hard-coded set to an empty string if it's NULL; I can't see a proper reason for that, since when deleting these lines all Tests still pass. Additionally, the tests for \TYPO3\Flow\Tests\Unit\Property\PropertyMapperTest::sourceWhichIsNoSimpleTypeThrowsException https://git.typo3.org/Packages/TYPO3.Flow.git/blob/master:/Tests/Unit/Property/PropertyMapperTest.php#l75 won't make any sense then.
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