Fail to open row on view without form
It is possible to define only a tree view on a One2Many for example. But if the user tries to open it (with double click or switch view), tryton goes into an infinite loop and sao open a dialog with the list but the wrong toolbar.
This is because switch_view may not always set the requested view type.
I think the client should do nothing if there is no view to "open" the row.