[examples][2pinfiltration] remove dgf exception handling

examples/2pinfiltration/main.cc

@@ -292,15 +292,6 @@ catch (const Dumux::ParameterException &e)
     std::cerr << std::endl << e << " ---> Abort!" << std::endl;
     return 1;
 }
-catch (const Dune::DGFException & e)
-{
-    std::cerr << "DGF exception thrown (" << e <<
-                 "). Most likely, the DGF file name is wrong "
-                 "or the DGF file is corrupted, "
-                 "e.g. missing hash at end of file or wrong number (dimensions) of entries."
-                 << " ---> Abort!" << std::endl;
-    return 2;
-}
 catch (const Dune::Exception &e)
 {
     std::cerr << "Dune reported error: " << e << " ---> Abort!" << std::endl;