Support of update in tables without updated column

[LionelLaffineur]

No description provided.

[gerryd]

At the very least I would move $updated_field = self::trait_get_table_field_updated(); outside of the if() and check against that instead of calling it twice.

But I am also curious why you are falling into this if() in the first place; what does is_dirty() do if you pass it null? And should it allow passing null in the first place?