缺少return语句和cppcheck

Question

我创建了一个函数

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js"></script>
<form action="/tasks/19" method="post">
  <input type="submit" value="Save" />
  <br>

  <label for="id_task_name">Task name:</label>
  <input style="width: 100%" id="id_task_name" maxlength="400" name="task_name" type="text" value="sample task" />

  <label for="id_repeat_type">Repeat type:</label>
  <select id="id_repeat_type" name="repeat_type">
    <option value="NR" selected="selected">No Repeat</option>
    <option value="IA">Repeat After X Days</option>
    <option value="IE">Repeat Every X Days</option>
  </select>

  <div id="repeat-options">
    <label for="id_repeat_days">Days between instances:</label>
    <input id="id_repeat_days" name="repeat_days" type="number" />
  </div>

  <br>
  <input type="submit" value="Save" />
</form>

然后运行CppCheck。它没有抱怨没有退货声明，如果它抱怨也是合理的。

为什么？