Adapt to API changes in the Jedis 5.0 driver.
Fix bzPopMaxShouldWorkCorrectly() and bzPopMinShouldWorkCorrectly() tests in JedisClusterConnectionTests.
Jedis 5.0 changed the bzpopmax and bzpopmin Redis commands to no longer return an empty (Array)List internally when evaluating and popping from an empty sorted set. A NullPointerException will be thrown if either bzpopmax or bzpopmin commands are executd on an empty Redis sorted set in Jedis 5.0 (vs. Jedis 4.x):
Closes#2612
Original pull request: #2716