safeguard MIME type output, fix ref
safeguard MIME type output, fix ref

tomkralidis/pycsw,kalxas/pycsw,tomkralidis/pycsw,kalxas/pycsw,ricardogsilva/pycsw,ingenieroariel/pycsw,ricardogsilva/pycsw,ricardogsilva/pycsw,bukun/pycsw,geopython/pycsw,geopython/pycsw,geopython/pycsw,ocefpaf/pycsw,ocefpaf/pycsw,kalxas/pycsw,tomkralidis/pycsw,bukun/pycsw,bukun/pycsw,ingenieroariel/pycsw