userTaskNoAssignee

<userTask> with no humanPerformer / potentialOwner / camunda:assignee / camunda:candidateGroups / camunda:candidateUsers / flowable:assignee — task may be unclaimed at runtime.

Full reference documentation for userTaskNoAssigneeis in progress. In the meantime, the rule's summary above describes the check, and the source implementation in lib/bpmn/rules/* on GitHub is the canonical specification.