Ensure selectable container fix

This fixes the issue when inserting a node with a child node but no text content, a```BR``` is added to the wrong place.
E.g. ```<p><b></b></p>``` => ```<p><b></b><br></p>``` when it should be ```<p><b><br></b></p>```
What's the difference? :-)

Oliver Joseph Ash
Software Engineer


On 2 July 2014 11:01, Sébastien Cevey <notifications@github.com> wrote:

> In src/plugins/core/formatters/html/ensure-selectable-containers.js:
>
> >          node.appendChild(document.createElement('br'));
> > +      } else if (node.children.length) {
>
> Also why do we use childNodes above and children here?
>
> —
> Reply to this email directly or view it on GitHub
> <https://github.com/guardian/scribe/pull/214/files#r14449251>.
>

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