Calls generates an error when a ModemManager modem disappears
May 07 12:58:17 pureos calls[952]: gtk_tree_model_foreach: assertion 'GTK_IS_TREE_MODEL (model)' failed
May 07 12:58:17 pureos calls[952]: remove_origin: assertion 'ok' failed
May 07 12:58:17 pureos calls[952]: gtk_label_set_text: assertion 'GTK_IS_LABEL (label)' failed