BUG 13712 Manual assignment doesn't validate when you don't select a user for the next task SOLVED

- Incorrect validation when the routing rule is "selection" and the next task assigment type is "manual"

- Fix incorrect validation
Merge pull request #2247 from julceslauhub/master

BUG 13712 Manual assignment doesn't validate when you don't select a user for the next task SOLVED