avoid creating pipeline responses and do it lazy

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

@@ -5,22 +5,29 @@ import redis.clients.jedis.exceptions.JedisDataException;
 public class Response<T> {
     protected T response = null;
     private boolean built = false;
+    private boolean set = false;
     private Builder<T> builder;
+    private Object data;
 
     public Response(Builder<T> b) {
         this.builder = b;
     }
 
     public void set(Object data) {
-        response = builder.build(data);
-        built = true;
+        this.data = data;
+        set = true;
     }
 
     public T get() {
-        if (!built) {
+        if (!set) {
             throw new JedisDataException(
                     "Please close pipeline or multi block before calling this method.");
         }
+        if (!built) {
+            response = builder.build(data);
+            this.data = null;
+            built = true;
+        }
         return response;
     }