Cafienne Engine Release 1.1.31

Hotfix

This release fixes an incomplete fix in release 1.1.30. When the case task fails, output mappings without expressions were no longer executed, but those with expressions still were, potentially leading to failures. That is now fixed.

Also the Swagger documentation was enriched on response messages of REST calls.

Tickets closed

Ticket	Description
#431	When a CaseTask fails, it should not perform output mappings
#433	Swagger API is lacking response description on getting Tasks, Cases and PlanItems