Wrapping {{#unless}} around {{yield}} does not pass through Controller properties

[alvincrespo]

When we wrap an {{#unless}} around the {{yield}} helper, we seem to be losing the context since no controller properties are being passed through to the rendered template.

    {{#unless amIDone}}
      {{yield}}
    {{/unless}}

JSBin: http://emberjs.jsbin.com/cefahe

[ebryn]

This looks like a duplicate of #10402. Has been fixed in canary, beta, and there will be a 1.10.1 release with this fix.

[alvincrespo]

@ebryn Thanks for your work on this!