Fix ffpe trap invalid
Description
This MR fixes remaining uninitialized variables in the code. Once these are fixed, we can enable the more strict compiler flags '--finit-real=snan -ffpe-trap=invalid' in some of the builders. This addresses one part of issue #379.
News snippet
This MR fixes remaining uninitialized variables in the code.
Checklist
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I have checked that my code follows the Octopus coding standards -
I have added tests for all the new features added in this request.
Edited by Martin Lueders