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tests: let C++ runtime handle uncaught exceptions for us

Ansgar Burchardt requested to merge ansgar/dune-grid-glue:bugfix/catch-by-value into master

All common C++ runtimes seem to have a default handler that prints out a helpful error message (including the text of the exception's what() output).

This addresses several compiler warnings from GCC 8 of the form:

warning: catching polymorphic type ‘class Dune::Exception’
by value [-Wcatch-value=]

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