bucket-create --wait can return early if the list of nodes is not yet populated

The nodes list for a bucket is not immediately populated. This means that in rare cases we may see the bucket-create command return early despite using --wait, as it will see an empty list and the logic assumes that if every node in that list is healthy then the bucket is ready.
Since a bucket should always be on at least one node, we should additionally wait until the nodes list is non-empty.