Don't throw std::exception but print message and exit

Fixes dune-common#23 (closed)

dune/istl/eigenvalue/test/cond2test.cc

@@ -52,7 +52,8 @@ int main (int argc, char** argv)
   }
   catch (std::exception& e)
   {
-    throw;
+    std::cout << "ERROR: " << e.what() << std::endl;
+    return 1;
   }
   catch (...)
   {