Remove image toolbar for empty configuration

[jodator]

📝 Provide detailed reproduction steps (if any)

I think that the empty image toolbar shouldn't be displayed:

I was testing this in restricted editing mode in which image styles are needed to properly display the side image but the toolbar is not needed in this mode.

Removing this by removing the image toolbar plugin probably would fix that, but maybe the default behavior should be to not display the empty toolbar.

ps.: maybe log some warning also?

✔️ Expected result

The empty toolbar is not displayed

❌ Actual result

That's that arrow hanging if you select an image.

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