On Chrome, have a field that supports autofill (you have to have set up an adress in Chrome first).
Click on that field, and apply the autofill proposition.
Before this commit, there was multiple crashes, roughly one for every handler of event `keydown`.
This was caused by the fact that the autofill feature triggers keydown events without the field `key`.
(https://bugs.chromium.org/p/chromium/issues/detail?id=581537, I could not find a better ticket).
This seems to be a bug on Chrome's side, since the spec doesn't mention that field may be unset (https://developer.mozilla.org/en-US/docs/Web/API/KeyboardEvent/key).
After this commit, there is no crash.
closesodoo/odoo#99348
Signed-off-by: Bruno Boi (boi) <boi@odoo.com>