Errors shouldn't block receiving fact check

www.agileplannerapp.com/boards/173808/cards/5005

the edition mentioned in the story had invalid
links in one of its parts. errors were causing
it to remain in 'fact_check' even after calling
event 'receive_fact_check'.

it seems unnecessary to validate the document
when we're receiving fact check response, hence
this change.
Merge pull request #191 from alphagov/production-bug-importing-vehicles

Errors shouldn't block receiving fact check