[orangecontrib][transformation] Remove widget when updating dataset

orangecontrib/darfix/widgets/transformation.py

@@ -26,7 +26,7 @@
 
 __authors__ = ["J. Garriga"]
 __license__ = "MIT"
-__date__ = "04/06/2021"
+__date__ = "14/06/2021"
 
 
 from silx.gui import qt
@@ -54,9 +54,13 @@ class TransformationWidgetOW(OWWidget):
 
     def __init__(self):
         super().__init__()
+        self._widget = None
 
     @Inputs.dataset
     def setDataset(self, dataset):
+        if self._widget:
+            self.controlArea.layout().removeWidget(self._widget)
+            self._widget.hide()
         if dataset:
             if not dataset[0].dims.ndim:
                 msg = qt.QMessageBox()