Kibana version: master

Describe the bug: empty string is producing empty label on the x axis

Steps to reproduce:

1. Install logs sample data
2. Drag in extension field
3. The largest bar doesn't have a label

Expected behavior:
Should have (empty) label

Screenshots (if relevant):
<img width="679" alt="Screenshot 2021-06-30 at 13 53 30" src="https://user-images

EuiSuperDatePicker should support onFocus. Given that there are multiple focusbale elements, the provided callback should likely only be called once on the initial element focus and not for each subcomponent focus event.

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