PHPCSStandards / PHP_CodeSniffer / 13839354231

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Config: add tests for setting `--extensions`

Includes minor bug fix to treat an empty value correctly.

Previously, passing `--extensions=` (without value) would result in the `Config::$extensions` property being set to:
```php
public $extensions = [
    '' => 'PHP'
];
```
Now, an empty value will set the extensions array to an empty array.
```php
public $extensions = [];
```

Note: in practice, the above change will not make a difference in how files are filtered/scanned.

:point_right: The change to the `Config` class will be most straight-forward to review while ignoring whitespace changes.

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