MyIntervals / emogrifier / 25507036559

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[CLEANUP] Make `AbstractHtmlProcessor::domDocument` private (#1621)

Also make it non-nullable as it will never be read before
initialization.

Access to the property already is guarded by the `getDomDocument()`
accessor, which we'll need to keep as we access it from the
outside.

We cannot guard the getter's code with an `assert` as PHPStan
would complain about a useless assert there. So rely on PHP
throwing an error if the getter is called before the property
is initialized.

Also improve some related comments.

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