Explicitly show that an empty argument type string ("") means 'no arguments'.

(You'll see why in the next commit..)

	modified:   controller/controller_load.c

controller/controller/controller_load.c

@@ -442,6 +442,7 @@ int controller_load_check_arg(char **expected_types, int supplied_argc,
     char **supplied_types)
 {
 	char **first;
+	char *str;
 	bool show_errs;
 	int ret;
 
@@ -476,8 +477,11 @@ int controller_load_check_arg(char **expected_types, int supplied_argc,
 	    "Invalid arguments! This function accepts %sthe following:",
 	    (expected_types[1] != NULL) ? "any of " : "");
 	expected_types = first;
-	while (*expected_types != NULL)
-		log_send(LOG_T_ERROR, "\t%s", *expected_types++);
+	while (*expected_types != NULL) {
+		str = *expected_types++;
+		log_send(LOG_T_ERROR, "\t%s", (*str != '\0') ?
+		    str : "(no arguments)");
+	}
 	if (supplied_argc) {
 		log_send(LOG_T_ERROR, "The given arguments are:");
 		int i;