With tryton, when trying to create a product image or removing all images for a product, the next traceback is shown: ``` File "/home/vant/Documentos/Clients/tryton6.8/.venv/lib/python3.8/site-packages/tryton/gui/window/view_form/view/list_form.py", line 200, in _select_show_row self.listbox.handler_block_by_func(self._select_show_row) TypeError: nothing connected to <bound method ViewListForm._select_show_row of <tryton.gui.window.view_form.view.list_form.ViewListForm object at 0x7f11a1214a60>> ``` Also, when switching next / back with the arrows sometimes I receive the following: ``` File "/home/vant/Documentos/Clients/tryton6.8/.venv/lib/python3.8/site-packages/tryton/gui/window/form.py", line 478, in sig_previous self.screen.display_prev() File "/home/vant/Documentos/Clients/tryton6.8/.venv/lib/python3.8/site-packages/tryton/gui/window/view_form/screen/screen.py", line 1115, in display_prev view.display() File "/home/vant/Documentos/Clients/tryton6.8/.venv/lib/python3.8/site-packages/tryton/gui/window/view_form/view/form.py", line 549, in display widget.display() File "/home/vant/Documentos/Clients/tryton6.8/.venv/lib/python3.8/site-packages/tryton/gui/window/view_form/view/form_gtk/one2many.py", line 553, in display self.screen.display() File "/home/vant/Documentos/Clients/tryton6.8/.venv/lib/python3.8/site-packages/tryton/gui/window/view_form/screen/screen.py", line 973, in display self.set_tree_state() File "/home/vant/Documentos/Clients/tryton6.8/.venv/lib/python3.8/site-packages/tryton/gui/window/view_form/screen/screen.py", line 864, in set_tree_state view.select_nodes(selected_nodes) File "/home/vant/Documentos/Clients/tryton6.8/.venv/lib/python3.8/site-packages/tryton/gui/window/view_form/view/list_form.py", line 149, in select_nodes self.listbox.handler_block_by_func(self.select_nodes) TypeError: nothing connected to <bound method ViewListForm.select_nodes of <tryton.gui.window.view_form.view.list_form.ViewListForm object at 0x7f11a1214a60>> ```