django.template.IncludedTemplateDoesNotExist exception is raised by the
include tag if the included template hasn't been found.
Fixed #8116 -- raise an exception if a included template doesn't exist
``django.template.IncludedTemplateDoesNotExist`` exception is raised by the
``include`` tag if the included template hasn't been found.
Closing PR as invalid (https://code.djangoproject.com/ticket/8116#comment:31) but leaving ticket open to second opinions.