Thehive: Update case owner field validation to handle null value

[nadouani]

Request Type

Bug

Problem Description

Via the case creation API, if the owner is provided with a null value, the API handles it as not specified and throws a Attribute owner is missing.

The API needs to be fixed handle the null value and set the API caller as owner.

[crackytsi]

@nadouani Note that we have the same issue for tasks, but tasks should (for my option) be able to get/keep the status "unassigned"

[nadouani]

Working on it, the tasks related issue is a UI issue