help to non-existing command + audio fix

src/logic/scripting/lua/libconsole.cpp

@@ -66,6 +66,9 @@ static int l_get_command_info(lua_State* L) {
     auto interpreter = engine->getCommandsInterpreter();
     auto repo = interpreter->getRepository();
     auto command = repo->get(name);
+    if (command == nullptr) {
+        return 0;
+    }
     const auto& args = command->getArgs();
     const auto& kwargs = command->getKwArgs();