Strict mode errors on unless block with nested property

[GriffinSauce]

When strict: true is added Handlebars errors on the use of a missing nested property in an unless block helper.

var myObject = {};

{{#unless myObject}}

{{/unless}}
-> no error

{{#unless myObject.prop.prop}}

{{/unless}}
-> error "prop doesn't exist"

As described in this issue strict mode shouldn't be enforced on helpers and conditional block. The point of a conditional block is to handle (non-)existence of properties.