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This change removes the default postback handler for the datatable widget (onSave) and instead relies on the closest form's request handler. While `onSave` was a safe default, it did not take into account the relation widget using other handlers. The table widget will use an explicitly specified handler first, then it will try and use the form's request handler, before using `onSave` as a fallback, although this should really never occur. Fixes #4776.