Merge pull request #1 from legiar/master

Fixed dispose socket so that it only disposes if the socket isn't null

Author: Arne Claassen

Beanstalk.Client/BeanstalkClient.cs

@@ -296,12 +296,14 @@ private void Dispose(bool suppressFinalizer) {
             if(suppressFinalizer) {
                 GC.SuppressFinalize(this);
             }
-            _socket.Dispose();
+	    if (_socket != null) {
+                _socket.Dispose();
+	    }
             _disposed = true;
         }
 
         ~BeanstalkClient() {
             Dispose(false);
         }
     }
-}
+}