[CO] Check winding definition

Author: BonneelP

pyleecan/GUI/Dxf/DXF_Slot.py

@@ -546,6 +546,13 @@ def save(self):
             slot = self.get_slot()
             if slot is None:
                 return  # Uncorrect slot
+            if self.si_wind_begin_index.value() == 0 and self.si_wind_end_index.value() == 0:
+                QMessageBox().warning(
+                    self,
+                    self.tr("Warning"),
+                    self.tr("The winding was not defined. Please use plot to see the points indices"),
+                )
+                return
             save_file_path = QFileDialog.getSaveFileName(
                 self, self.tr("Save file"), dirname(self.dxf_path), "Json (*.json)"
             )[0]