Fix a couple of minor issues identified by Jeff

orte/runtime/orte_mca_params.c

@@ -365,10 +365,14 @@ int orte_register_params(void)
     /* default dash-host */
     orte_default_dash_host = NULL;
     (void) mca_base_var_register ("orte", "orte", NULL, "default_dash_host",
-                                  "Default -host setting, \"none\" to ignore environmental or default MCA param setting)",
+                                  "Default -host setting (specify \"none\" to ignore environmental or default MCA param setting)",
                                   MCA_BASE_VAR_TYPE_STRING, NULL, 0, 0,
                                   OPAL_INFO_LVL_9, MCA_BASE_VAR_SCOPE_READONLY,
                                   &orte_default_dash_host);
+    if (0 == strcmp(orte_default_dash_host, "none")) {
+        free(orte_default_dash_host);
+        orte_default_dash_host = NULL;
+    }
 
     /* regex of nodes in system */
     orte_node_regex = NULL;

orte/util/dash_host/dash_host.c

@@ -81,8 +81,8 @@ int orte_util_add_dash_host_nodes(opal_list_t *nodes,
                     goto cleanup;
                 }
             }
-            opal_argv_free(mini_map);
         }
+        opal_argv_free(mini_map);
     }
     opal_argv_free(host_argv);
     mini_map = NULL;
@@ -127,6 +127,13 @@ int orte_util_add_dash_host_nodes(opal_list_t *nodes,
                     /* they want a specific relative node #, so
                      * look it up on global pool
                      */
+                    if ('\0' == mapped_nodes[i][2]) {
+                        /* they forgot to tell us the # */
+                        orte_show_help("help-dash-host.txt", "dash-host:invalid-relative-node-syntax",
+                                       true, mapped_nodes[i]);
+                        rc = ORTE_ERR_SILENT;
+                        goto cleanup;
+                    }
                     nodeidx = strtol(&mapped_nodes[i][2], NULL, 10);
                     if (nodeidx < 0 ||
                         nodeidx > (int)orte_node_pool->size) {