Plane: cli test checks read_cmd success before printing

ArduPlane/test.pde

@@ -291,9 +291,10 @@ test_wp(uint8_t argc, const Menu::arg *argv)
 
     for(uint8_t i = 0; i <= mission.num_commands(); i++) {
         AP_Mission::Mission_Command temp_cmd;
-        mission.read_cmd_from_storage(i,temp_cmd);
+        if (mission.read_cmd_from_storage(i,temp_cmd)) {
             test_wp_print(temp_cmd);
         }
+    }
 
     return (0);
 }