catch format errors and print suitable error message

src/main.cpp

@@ -64,9 +64,15 @@ int main(int argc, char **argv)
     exit(1);
   }
 #else
+  try {
     LAMMPS *lammps = new LAMMPS(argc,argv,MPI_COMM_WORLD);
     lammps->input->file();
     delete lammps;
+  } catch(fmt::format_error &fe) {
+    fprintf(stderr,"fmt::format_error: %s\n", fe.what());
+    MPI_Abort(MPI_COMM_WORLD, 1);
+    exit(1);
+  }
 #endif
   MPI_Barrier(MPI_COMM_WORLD);
   MPI_Finalize();