Markus Zolliker 1c33a41748 treat return value of write_<par> correctly
if the return value is 0 or "", and value is different from it,
then the behaviour is incorrect.
Alternative: we do not allow write_<par> to return None, and
check for it, or even validate the returned value.

Change-Id: If7381dd06f7c55bdc4a80981e67f831cd8ee4136
Reviewed-on: https://forge.frm2.tum.de/review/19728
Tested-by: JenkinsCodeReview <bjoern_pedersen@frm2.tum.de>
Reviewed-by: Enrico Faulhaber <enrico.faulhaber@frm2.tum.de>
2019-01-11 15:06:41 +01:00
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