OWDataProjectionWidget: Consider tables with nan-s equal

Author: VesnaT

Orange/widgets/visualize/utils/widget.py

@@ -421,8 +421,9 @@ def set_data(self, data):
             self.init_attr_values()
         self.openContext(self.data)
         self.__invalidated = not (data_existed and self.data is not None and
-                                  np.array_equal(effective_data.X,
-                                                 self.effective_data.X))
+                                  np.allclose(effective_data.X,
+                                              self.effective_data.X,
+                                              equal_nan=True))
         if self.__invalidated:
             self.clear()
         self.cb_class_density.setEnabled(self.can_draw_density())