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Fabian Freund
ed5955a5c7
The bug was introduced in commit 8769b7c6d (typification of result items); this
patch fixes the bug and also addresses the peculiarity that fields can be set
but contain no *usable* value:
If a field is set (exists) but contains an empty string or the value ``None``,
it is also considered *not set*. This also ensures that an integer 0 is
evaluated *as set*!
Co-Authored: Markus Heiser <markus.heiser@darmarit.de>