Fix nil permissions bug
Fix nil permissions bug

If role is not assigned in _roles.yml fatal error will happen. This
will avoid it. I couldn't figure out where to write tests.

Signed-off-by: Francesc Esplugas <352bf3ec073356d71f47cfcff2e546760ec67027@gmail.com>

brainsome-de/typus,thirdthing/typus,readyfor/typus,brainsome-de/typus,brainsome-de/typus,chiragshah/typus,burn-notice/typus,thirdthing/typus,wollzelle/typus,baban/typus,typus/typus,chiragshah/typus,readyfor/typus,typus/typus,baban/typus,readyfor/typus,thirdthing/typus,typus/typus,wollzelle/typus,chiragshah/typus,burn-notice/typus,typus/typus,thirdthing/typus,baban/typus,burn-notice/typus,brainsome-de/typus,baban/typus,chiragshah/typus,wollzelle/typus,wollzelle/typus,burn-notice/typus,readyfor/typus