Default templates not rendered

[roblillack]

When serving requests without initializing a TemplateLoader (see #11), the embedded templates do not get served for error pages, instead something along the lines of:

Server Error:
Not Found: No matching route found: /

Additionally, an error occurred when rendering the error page:
no template loader

Is displayed.

[roblillack]

Fixed with https://github.com/roblillack/mars/releases/tag/v1.0.1