Merge branch 'feature/revert-noexept' into 'master'

Martin Nolterequested to merge
cherry-pick-22d3a9df into releases/2.6

Remove noexcept from ParallelIndexSet::operator[]

See merge request !238 (merged)

(cherry picked from commit 22d3a9df)

4c2976a0 Remove noexcept from ParallelIndexSet::operator[]

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