Issue #158 is fixed: Response.get() returns null if redis returned null (i.e. when using zscore for a non existing member)

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

@@ -24,10 +24,12 @@ public class Response<T> {
                     "Please close pipeline or multi block before calling this method.");
         }
         if (!built) {
-        	if (data instanceof JedisDataException){
+        	if(data != null ){
-        		throw new JedisDataException((JedisDataException)data);
+	        	if (data instanceof JedisDataException){
+	        		throw new JedisDataException((JedisDataException)data);
+	        	}
+	            response = builder.build(data);
         	}
-            response = builder.build(data);
             this.data = null;
             built = true;
         }

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

@@ -89,6 +89,29 @@ public class PipeliningTest extends Assert {
         assertEquals(1, smembers.get().size());
         assertEquals(1, zrangeWithScores.get().size());
     }
+    
+    @Test
+    public void pipelineResponseWithData() {
+        jedis.zadd("zset", 1, "foo");
+        
+        Pipeline p = jedis.pipelined();
+        Response<Double> score = p.zscore("zset", "foo");
+        p.sync();
+
+        assertNotNull(score.get());    
+    }
+    
+    @Test
+    public void pipelineResponseWithoutData() {
+        jedis.zadd("zset", 1, "foo");
+        
+        Pipeline p = jedis.pipelined();
+        Response<Double> score = p.zscore("zset", "bar");
+        p.sync();
+
+        assertNull(score.get());
+    }
+
 
     @Test(expected = JedisDataException.class)
     public void pipelineResponseWithinPipeline() {