Allow passing null/undefined literals subexpressions

[blimmer]

I originally filed this on the Ember.JS tracker but was directed here, instead.

It would be really great if subexpressions could handle null and undefined literals. It doesn't appear to work that way currently. I have an EmberJS JSBin that shows the issue I'm talking about.

[mmun]

Not just subexpressions. They would need to fit anywhere an Expression can go.

In theory the HTMLBars parser could deal with this (by substituting any PathExpression whose original param is 'null' with a new NullLiteral node), but I'd prefer to get it merged into Handlebars so we don't diverge further.

[mmun]

Thank you!! :)

[mmun]

BTW your patch doesn't support {{null}} and {{undefined}} so it diverges from how boolean/number/etc are treated. I don't really care that much though. Sorry to be a pain...

[kpdecker]

@mmun, dfd141c adds support for null and undefined in the helper name/path section.

[mmun]

Thanks.

[kpdecker]

Released in 3.0.2