Export button should not show up on empty List page

[fzaninotto]

When new users discover a react-admin app, and they have no data yet, the list screen is intimidating. It shows a "no results found" and an export button...

• If there is no result, the export button should not appear - or should appear greyed out

[afilp]

@fzaninotto Regarding the default "EXPORT" functionality, in most cases we do not need this, as it would require us to do major work on custom "exporter" functions, while the client does not need an export at all.

Instead of us having to create our own actions component, could we just use exporter = {false} in order to disable the "EXPORT" functionality? (not show it at all).

The above proposal is exactly similar to what we do with bulkActions={false}.

[afilp]

Concerning my latest comment above, I have created a PR for your evaluation.

I already use this option in my projects (i.e. hiding the export button in certain Lists) and I have the feeling that others may need it too. It is up to you to decide. Thanks!