make default settings() functions for bonded interactions error out with arguments

src/improper.cpp

@@ -73,6 +73,16 @@ void Improper::init()
   init_style();
 }
 
+/* ----------------------------------------------------------------------
+   check that there are no arguments
+------------------------------------------------------------------------- */
+
+void Improper::settings(int narg, char **args)
+{
+  if (narg > 0)
+    error->all(FLERR, "Illegal improper_style {} argument: {}", force->improper_style, args[0]);
+}
+
 /* ----------------------------------------------------------------------
    setup for energy, virial computation
    see integrate::ev_set() for bitwise settings of eflag/vflag