Fix throw/crash when using the tmpl_path ctor
Fix throw/crash when using the tmpl_path ctor

Using a template_t constructed with a tmpl_path would throw/crash in
render() due to uninitialized member "section".

mrtazz/plustache,thecocce/plustache,cgcgbcbc/plustache,cgcgbcbc/plustache,chesles/plustache,kylealanhale/plustache,thecocce/plustache,cgcgbcbc/plustache,ShiweiJuliaHuang/plustache,ShiweiJuliaHuang/plustache,kylealanhale/plustache,kylealanhale/plustache,mrtazz/plustache,chesles/plustache,ShiweiJuliaHuang/plustache,chesles/plustache,thecocce/plustache