[grid] Update DefaultSlotSelector
// And use the node id as a tie-breaker.
.thenComparing(NodeStatus::getId))
.flatMap(node -> node.getSlots().stream()
- .filter(slot -> !slot.getSession().isPresent())
+ .filter(slot -> slot.getSession()==null)
.filter(slot -> slot.isSupporting(capabilities))
.map(Slot::getId))
.collect(toImmutableSet());
