Initialize slim-related attributes regardless of when slim was loaded
Initialize slim-related attributes regardless of when slim was loaded

Setting instance attributes of the Template class cannot depend on
whether slim has been loaded before or not.

benignbala/asciidoctor,anthonny/asciidoctor,asciidocfx/asciidoctor,asciidocfx/asciidoctor,benignbala/asciidoctor,anthonny/asciidoctor