Add failing test for dotted access inside section (should this work?)

[maio]

Fails (prints nothing): {{#photos}} {{thumb.src}} {{/photos}}

Works (prints photo's thumb's src): {{#photos}} {{#thumb}}{{src}}{{/thumb}} {{/photos}}

First example should work same as second one, but it fails.

[fhd]

Yeah, that's quite definitely a bug. Seems like it slipped through the spec tests.