[!52] Fix compiler warning when catching exceptions

Timo Kochrequested to merge
cherry-pick-84dddfef into releases/2.6

Merge branch 'cleanup/fix-compiler-warning-exception-handler' into 'master'

See merge request extensions/dune-foamgrid!52

(cherry picked from commit 84dddfef)

257bfd75 Fix compiler warning when catching exceptions

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