error when opening price list lines in 7.4
Error appears in 7.4 when push button "Open Lines" in Products-Price Lists:
```
ERROR:tryton.common.common: File "/home/mindauga/Containers/tryton_test_313_venv/lib64/python3.13/site-packages/tryton/gui/window/view_form/view/form.py", line 608, in button_clicked
self.screen.button(widget.attrs)
~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^
File "/home/mindauga/Containers/tryton_test_313_venv/lib64/python3.13/site-packages/tryton/gui/window/view_form/screen/screen.py", line 1255, in button
self._button_class(button)
~~~~~~~~~~~~~~~~~~^^^^^^^^
File "/home/mindauga/Containers/tryton_test_313_venv/lib64/python3.13/site-packages/tryton/gui/window/view_form/screen/screen.py", line 1287, in _button_class
Action.execute(action, {
~~~~~~~~~~~~~~^^^^^^^^^^
'model': self.model_name,
^^^^^^^^^^^^^^^^^^^^^^^^^
'id': self.current_record.id,
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
'ids': ids,
^^^^^^^^^^^
}, context=self.context, keyword=True)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/mindauga/Containers/tryton_test_313_venv/lib64/python3.13/site-packages/tryton/action/main.py", line 54, in execute
Action._exec_action(action, data, context=context)
~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/mindauga/Containers/tryton_test_313_venv/lib64/python3.13/site-packages/tryton/action/main.py", line 139, in _exec_action
Window.create(res_model, **params)
~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^
File "/home/mindauga/Containers/tryton_test_313_venv/lib64/python3.13/site-packages/tryton/gui/window/window.py", line 32, in create
win = Form(model, **attributes)
File "/home/mindauga/Containers/tryton_test_313_venv/lib64/python3.13/site-packages/tryton/gui/window/form.py", line 54, in __init__
self.screen = Screen(self.model, breadcrumb=[self.name], **attributes)
~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/mindauga/Containers/tryton_test_313_venv/lib64/python3.13/site-packages/tryton/gui/window/view_form/screen/screen.py", line 88, in __init__
self.context_screen.new()
~~~~~~~~~~~~~~~~~~~~~~~^^
File "/home/mindauga/Containers/tryton_test_313_venv/lib64/python3.13/site-packages/tryton/gui/window/view_form/screen/screen.py", line 670, in new
record = group.new(default, defaults=defaults)
File "/home/mindauga/Containers/tryton_test_313_venv/lib64/python3.13/site-packages/tryton/gui/window/view_form/model/group.py", line 387, in new
record.default_get(defaults=defaults)
~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^
File "/home/mindauga/Containers/tryton_test_313_venv/lib64/python3.13/site-packages/tryton/gui/window/view_form/model/record.py", line 429, in default_get
return vals
^^^^
UnboundLocalError: cannot access local variable 'vals' where it is not associated with a value
```
issue