Ember inline if gives error TypeError: options.template is undefined

If I do

   
     <li class="active"><a href="#"></a></li>
   
     <li><a href="#"></a></li>
   
 

It works well, but it is too repetitive...

I wanna make an inline if like this:

    <li ><a href="#"></a></li>

But this gives the following error:

TypeError: options.template is undefined

Which I couldn't find anywhere. The closest topic I found was this one, but it is not what I want...

My eq helper is:

import Ember from 'ember';
const eq = (params) => params[0] === params[1];
export default Ember.Helper.helper(eq);