remove obsolete unittest code specific to handling the case of lammps exceptions disabled

unittest/commands/test_groups.cpp

@@ -469,9 +469,6 @@ int main(int argc, char **argv)
     MPI_Init(&argc, &argv);
     ::testing::InitGoogleMock(&argc, argv);
 
-    if (LAMMPS_NS::platform::mpi_vendor() == "Open MPI" && !Info::has_exceptions())
-        std::cout << "Warning: using OpenMPI without exceptions. Death tests will be skipped\n";
-
     // handle arguments passed via environment variable
     if (const char *var = getenv("TEST_ARGS")) {
         std::vector<std::string> env = LAMMPS_NS::utils::split_words(var);