Raise exception if TemplateView can't find any templates

Author: davegaeddert

bolt/views/templates.py

@@ -53,6 +53,8 @@ def get_template(self) -> Template:
             except TemplateFileMissing:
                 pass
 
+        raise TemplateFileMissing()
+
     def render_template(self) -> str:
         return self.get_template().render(self.get_template_context())