Use empty text for empty Reference in editable tree

issue9052
review291491002

tryton/gui/window/view_form/model/field.py

@@ -872,7 +872,7 @@ class ReferenceField(Field):
                         pass
                 if '%s,%s' % (ref_model, ref_id) == self.get(record):
                     rec_name = record.value.get(
-                        self.name + '.', {}).get('rec_name', '')
+                        self.name + '.', {}).get('rec_name') or ''
                 else:
                     rec_name = ''
             record.value.setdefault(self.name + '.', {})['rec_name'] = rec_name
@@ -907,7 +907,7 @@ class ReferenceField(Field):
         elif ref_model:
             rec_name = ''
         else:
-            rec_name = str(ref_id)
+            rec_name = str(ref_id) if ref_id is not None else ''
         record.value[self.name] = ref_model, ref_id
         record.value.setdefault(self.name + '.', {})['rec_name'] = rec_name
 

tryton/gui/window/view_form/view/list_gtk/editabletree.py

@@ -307,9 +307,11 @@ class EditableTreeView(TreeView):
             text = entry.props.value
         elif isinstance(entry, Gtk.ComboBox):
             model = entry.get_model()
-            text = model.get_value(
-                entry.get_active_iter(),
-                entry.props.entry_text_column)
+            iter_ = entry.get_active_iter()
+            if iter_:
+                text = model.get_value(iter_, entry.props.entry_text_column)
+            else:
+                text = ''
         else:
             text = entry.get_text()
         self.on_quit_cell(record, column, renderer, text)