A new `is-empty` helper should be added

This should use the Ember.isEmpty function, and consider changing truthConvert to no longer be falsy for empty arrays. That’s not how JS works, and truth helpers aren’t block helpers. Consider encourage users to use (is-empty value) or (not (is-empty value)) to check arrays. This change would require a semver major bump.

[rwjblue]

I think adding is-empty seems fine, but I’m not convinced that truthConvert should be changed. Frankly, the idea that this isn’t how JS works doesn’t really hold much sway to me. HBS is not JS, and Ember fundamentally considers empty arrays as falsey in HBS.

[cmackenz]

It would be nice if this also checked for empty objects {}

Ember.isEmpty returns false when checking {} so I had to create a helper that checked the length of my object’s key length. eg., Object.keys(myObject).length === 0 returns true.

or maybe it’s better to create a new helper is-empty-object