Backports PR #9354

**Commit 1:**
Tag Cloud should deal with empty responses correctly

tag cloud did not work with empty responses correctly. One of the side-effects is that the back button did not work properly. For example, pressing the back button would not empty out the screen and show stale clouds.

This also caused a type-error. Empty configurations meant that we could not access any aggregation-configs to produce a label.

* Original sha: 9b52ba4
* Authored by Thomas Neirynck <thomas@elastic.co> on 2016-12-02T22:58:54Z

Backports PR #9354

**Commit 1:**
Tag Cloud should deal with empty responses correctly

tag cloud did not work with empty responses correctly. One of the side-effects is that the back button did not work properly. For example, pressing the back button would not empty out the screen and show stale clouds.

This also caused a type-error. Empty configurations meant that we could not access any aggregation-configs to produce a label.

* Original sha: 9b52ba4
* Authored by Thomas Neirynck <thomas@elastic.co> on 2016-12-02T22:58:54Z

## Dependency updates

- `@elastic/eui`: v112.2.0 ⏩ v112.3.0
- `@elastic/eslint-plugin-eui`: v2.7.0 ⏩ v2.8.0

---

## Package updates

### `@elastic/eui`
[v112.3.0](https://github.com/elastic/eui/releases/tag/v112.3.0)

- Added new `server` icon.
([#9355](elastic/eui#9355))
- Added `className` support to `EuiMarkdownEditor`'s `toolbarProps` for
custom toolbar styling
([#9349](elastic/eui#9349))
- Updated `EuiFilePicker` to use the `upload` icon to better indicate
uploads. ([#9351](elastic/eui#9351))
- Exported the flyout system store singleton and added an event observer
for emitting close session events
([#9347](elastic/eui#9347))
- Updated `EuiIcon` to use standard dynamic imports for icon assets,
enabling native support for modern bundlers (Rollup, Parcel) and
improving initial load performance
([#9342](elastic/eui#9342))

**Bug fixes**

- Fixed a potential crash in the flyout system: due to asynchronous
state updates and React's batching behavior, it was possible to
experience a crash when closing a managed flyout.
([#9356](elastic/eui#9356))

### `@elastic/eslint-plugin-eui` v2.8.0

- Added new `icon-accessibility-rules` rule.
([#9357](elastic/eui#9357))
- Added new `badge-accessibility-rules` rule.
([#9354](elastic/eui#9354))