little fix

toolkit.py

@@ -1433,7 +1433,7 @@ class ClassificationProjectRNN(ClassificationProject):
                 rnn_inputs.append(chan_inp)
                 rnn_channels.append(channel)
             flat_input = Input((len(self.flat_fields),))
-            if self.dropout_input is None:
+            if self.dropout_input is not None:
                 flat_channel = Dropout(rate=self.dropout_input)(flat_input)
             else:
                 flat_channel = flat_input