throw JedisDataException when sending NULL values to redis as it is not a valid value in the protocol

src/test/java/redis/clients/jedis/tests/JedisTest.java

@@ -9,6 +9,7 @@ import redis.clients.jedis.Jedis;
 import redis.clients.jedis.JedisShardInfo;
 import redis.clients.jedis.Protocol;
 import redis.clients.jedis.exceptions.JedisConnectionException;
+import redis.clients.jedis.exceptions.JedisDataException;
 import redis.clients.jedis.tests.commands.JedisCommandTestBase;
 import redis.clients.util.SafeEncoder;
 
@@ -53,4 +54,9 @@ public class JedisTest extends JedisCommandTestBase {
         Thread.sleep(20000);
         jedis.hmget("foobar", "foo");
     }
+
+    @Test(expected = JedisDataException.class)
+    public void failWhenSendingNullValues() {
+        jedis.set("foo", null);
+    }
 }