Merge pull request #34 from bapti/has-value

RedisValue HasValue property

StackExchange.Redis/StackExchange/Redis/RedisValue.cs

@@ -60,6 +60,17 @@ public bool IsNullOrEmpty
             }
         }
 
+        /// <summary>
+        /// Indicates whether the value is greater than zero-length
+        /// </summary>
+        public bool HasValue
+        {
+            get
+            {
+                return valueBlob != null && valueBlob.Length > 0;
+            }
+        }
+
         /// <summary>
         /// Indicates whether two RedisValue values are equivalent
         /// </summary>