[RDF] Silence a diagnostic in dataframe_simple.
[RDF] Silence a diagnostic in dataframe_simple.

Also change a catch clause. On Mac, tbb throws a tbb exception type,
whereas it throws a runtime_error on other platforms. This would lead to
the exception not being caught, which fails the test.

olifre/root,olifre/root,olifre/root,olifre/root,olifre/root,olifre/root,olifre/root,olifre/root,olifre/root,olifre/root,olifre/root