While testing, if <IconRegistry /> is rendered, fireEvent() returns an error

## 🐛 Bug Report
While testing with `@testing-library/react-native`, if inside the rendered component there is `` (so every time I need to render a component that has an icon), the function `fireEvent` returns `TypeError: Cannot read property 'pointerEvents' of null`.

```bash
TypeError: Cannot read property 'pointerEvents' of null

27 | expect(getByA11yLabel('backFiveSeconds')).toBeTruthy();
28 | expect(getByText('-5s')).toBeTruthy();
> 29 | fireEvent(getByA11yLabel('backFiveSeconds'), 'press');
| ^
30 | expect(spy).toHaveBeenCalled();
31 | });
32 | });
```

Without IconRegistry it does work as expected.

## To Reproduce

Steps to reproduce the behavior:

Code sample:
```
import React from 'react';
import { render, fireEvent, act } from '@testing-library/react-native';
import * as eva from '@eva-design/eva';
import { ApplicationProvider, IconRegistry, Button, Text } from '@ui-kitten/components';
import { EvaIconsPack } from '@ui-kitten/eva-icons';

import theme from '../../../uiTheme.json';

describe(' > ', () => {
it('Renders correctly and call the callback fn', async () => {
const spy = jest.fn();
const { getByText, getByA11yLabel } = render(
<>



{(props) => -5s}



);
expect(getByA11yLabel('backFiveSeconds')).toBeTruthy();
expect(getByText('-5s')).toBeTruthy();
fireEvent(getByA11yLabel('backFiveSeconds'), 'press'); // => TypeError: Cannot read property 'pointerEvents' of null
expect(spy).toHaveBeenCalled();
});
});
```
Run with `jest `.

## Expected behavior
I do expect the press event to be fired correctly.

## Link to runnable example or repository (highly encouraged)

## UI Kitten and Eva version

| Package | Version |
| ----------- | ----------- |
| @eva-design/eva | 2.1.0 |
| @ui-kitten/eva-icons | 5.1.0 |
| @ui-kitten/components | 5.1.10 |
| react | 17.0.1 |
| @testing-library/react-native | 7.2.0 |
| jest | 26.6.3|

## Environment information

```bash
System:
OS: macOS 11.5.1
CPU: (8) arm64 Apple M1
Binaries:
Node: 15.14.0 - ~/.nvm/versions/node/v15.14.0/bin/node
Yarn: 1.22.10 - ~/.nvm/versions/node/v15.14.0/bin/yarn
npm: 7.7.6 - ~/.nvm/versions/node/v15.14.0/bin/npm
Watchman: 2021.06.07.00 - /opt/homebrew/bin/watchman
SDKs:
iOS SDK:
Platforms: iOS 14.5, DriverKit 20.4, macOS 11.3, tvOS 14.5, watchOS 7.4
Android SDK:
API Levels: 29, 30
Build Tools: 29.0.2
IDEs:
Xcode: 12.5.1/12E507 - /usr/bin/xcodebuild
npmPackages:
react: 17.0.1 => 17.0.1
react-native: 0.64.2 => 0.64.2
```