debug crash when double clic on PK combobox when no reach is selected (DIF window)

src/View/DIFAdisTS/Table.py

@@ -62,9 +62,12 @@ class ComboBoxDelegate(QItemDelegate):
         if self._mode == "rk":
             reach_id = self._ic_spec_lst[index.row()].reach
 
-            reach = next(filter(
+            reach = next(
+                filter(
                     lambda edge: edge.id == reach_id, self._data.edges()
-            ))
+                ),
+                None
+            )
 
             if reach_id is not None:
                 val = list(