DATAREDIS-1021 - Fix not null assertion in KeyCommands.

Author: christophstrobl

src/main/java/org/springframework/data/redis/connection/jedis/JedisKeyCommands.java

@@ -106,7 +106,7 @@ public Long exists(byte[]... keys) {
 	@Override
 	public Long del(byte[]... keys) {
 
-		Assert.noNullElements(keys, "Keys must not be null!");
+		Assert.notNull(keys, "Keys must not be null!");
 		Assert.noNullElements(keys, "Keys must not contain null elements!");
 
 		try {

src/main/java/org/springframework/data/redis/connection/lettuce/LettuceKeyCommands.java

@@ -114,7 +114,7 @@ public Long exists(byte[]... keys) {
 	@Override
 	public Long del(byte[]... keys) {
 
-		Assert.noNullElements(keys, "Keys must not be null!");
+		Assert.notNull(keys, "Keys must not be null!");
 		Assert.noNullElements(keys, "Keys must not contain null elements!");
 
 		try {