Make List children responsible of the empty state

[djhi]

Problem

Currently the <List> component is responsible for displaying something when there is no data. However, we introduced the empty prop on the <Datagrid> component as well. When passing empty={false} to the <List>, it displays its child and the empty provided to the <Datagrid> is then used.

However, the <Pagination> component also displays something special when there is no data, which is not desirable in this case.

Solution

Make handling empty state the responsibility of the <List> child when the <List> doesn't. Both the <Datagrid> and the <SimpleList> now accept an empty prop. This prop accepts either an element or false.

Besides, we deprecated the limit prop on the <Pagination> component. It now renders null when there is no data.