v-for shows 'undefined' for empty lists

[ppasieka]

Version

2.5.0

Reproduction link

http://jsfiddle.net/gfnz6wda/2/

Steps to reproduce

I have a list with template like

<ul>
  <li v-for="todo in todos">
    {{ todo }}
  </li>
  <li v-if="!todos.length">No todos at this moment.</li>
</ul>

where in case of empty list some fallback li element is shown.

After update to 2.5 - empty todos array - renders undefined.

like this

undefined
No todos at this moment.

What is expected?

Do not render 'undefined' for empty array

What is actually happening?

Renders 'undefined'.

---

hope it is a bug... because I have quite a lot cases like that in my app
Thx

[posva]

Looks like it was already fixed #6790