Warning message, when 'run' is called without job

(tran, op, ac etc.) is defined.

src/frontend/runcoms.c

@@ -349,6 +349,12 @@ static int dosim(
             err = 1;
             cp_vset("sim_status", CP_NUM, &err);
         }
+        else if (err == 3) {
+            fprintf(cp_err, "%s simulation not started\n", what);
+            ft_curckt->ci_inprogress = FALSE;
+            err = 1;
+            cp_vset("sim_status", CP_NUM, &err);
+        }
         else {
             ft_curckt->ci_inprogress = FALSE;
         }

src/frontend/spiceif.c

@@ -330,6 +330,11 @@ if_run(CKTcircuit *ckt, char *what, wordlist *args, INPtables *tab)
     if (eq(what, "run")) {
         ft_curckt->ci_curTask = ft_curckt->ci_defTask;
         ft_curckt->ci_curOpt = ft_curckt->ci_defOpt;
+        if (ft_curckt->ci_curTask->jobs == NULL) {
+            /* nothing to 'run' */
+            fprintf(stderr, "Warning: No job (tran, ac, op etc.) defined:\n");
+            return (3);
+        }
     }
 
     /* -- Find out what we are supposed to do.              */