Let print answer if user can read responses.

Do not exit controller if user has read permissions over responses.
As so allow to print if setting "Participant may print answers" is set to true or if user has read permission over responses.
If not allowed, No echo, but send a 401

Implemented Denis Chenu's suggestion
Merge pull request #262 from gabrieljenik/patch-7

Fixed issue #9413 - Let print answer if user can read responses.