BinaryJedis.multi(TransactionBlock) should not call discard when exception occurred

* In BinaryJedis.multi(TransactionBlock), multi & exec already fired before exception occured, so sending discard has no effect, and made another error
** add unit test (error inside TransactionBlock)
*** Transaction with error - Redis discards transaction automatically (execabort)
*** Transaction with error - Redis doesn't roll back (force to execute all)

src/main/java/redis/clients/jedis/BinaryJedis.java

@@ -1685,13 +1685,9 @@ public class BinaryJedis implements BasicCommands, BinaryJedisCommands, MultiKey
     public List<Object> multi(final TransactionBlock jedisTransaction) {
 	List<Object> results = null;
 	jedisTransaction.setClient(client);
-	try {
-	    client.multi();
-	    jedisTransaction.execute();
-	    results = jedisTransaction.exec();
-	} catch (Exception ex) {
-	    jedisTransaction.discard();
-	}
+    client.multi();
+    jedisTransaction.execute();
+    results = jedisTransaction.exec();
 	return results;
     }