Ember 2.1: <a href={{condition}}> results in <a href="null"> after condition was dynamically set to null

[lolmaus]

Crossposting from emberjs/ember.js#12358

---

So you've got this in your template:

<a href={{condition}}>

condition is null, and it correctly renders to <a>.

But then you change condition dynamically.

When condition is null again, it renders as <a href="null">.

Demo (thx to @alexspeller): http://ember-twiddle.com/a0a8088d67b451817902

[lolmaus]

Please confirm that this issue belongs here so that I can close the other one.