MyIntervals / PHP-CSS-Parser / 13516869109

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[CLEANUP] Use `null` for unset value in `DeclarationBlock::parse()` (#988)

The variable is either a string or it isn't.
The best practice for when it isn't is for it to be `null` or `unset()`.

Using `false` for when it isn't can lead to type-safety issues.
Reference:
https://vulke.medium.com/when-should-variables-be-null-false-undefined-or-an-empty-string-in-php-4ebd73c7a954

Also use `===` in a comparison in the affected code.

Resolves #975.
Part of #976.

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