Revision on https://github.com/odoo/odoo/commit/3210f108272be89f1a7b01f4e1816b7f04ae0a3b
Before this commit, when doing an action that opens a dialog
(with `target: 'new'`), then triggering 'history_back', the
`on_close` handler of the action was never called.
This was not the correct behaviour, because the dialog closes
without the `silent` option set. Indeed, when this option is
not set, it should always call the `on_close` handler.
The bug comes from closing the dialog without any options, and
this case was not handled correctly in the commit above. This
commit fixes the problem by ensuring that the `on_close` handler
is called even when closing the dialog without any option.
Alexandre Kühn
de1631c717