When no template is installed juno raises an exception

[marianoguerra]

if I don't install jinja and my application raises an exception, then juno tries to render the error using a template, no matter if I said 'use_templates': False on juno.init

the traceback:

Traceback (most recent call last):
File "/usr/lib/python2.6/wsgiref/handlers.py", line 93, in run
self.result = application(self.environ, self.start_response)
File "/home/mariano/Proyectos/taskr/juno.py", line 727, in application
**environ)
File "/home/mariano/Proyectos/taskr/juno.py", line 200, in request
return servererror(error=cgi.escape(str(sys.exc_info()))).render()
File "/home/mariano/Proyectos/taskr/juno.py", line 507, in servererror
return template(file, error=error)
File "/home/mariano/Proyectos/taskr/juno.py", line 552, in template
return append(render_template(t, *_kwargs))
File "/home/mariano/Proyectos/taskr/juno.py", line 574, in render_template
return config('render_template_handler')(template_obj, *_kwargs)
File "/home/mariano/Proyectos/taskr/juno.py", line 585, in _render_template_handler
return template_obj.render(**kwargs).encode(config('charset'))
AttributeError: 'NoneType' object has no attribute 'render'