Update toHtml method return type and docblock #14
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This PR fixes
toHtml's docblock of the return types.Method
toHtmlhad@return string|null|\LogicExceptionin the PHPDoc, but an instance ofLogicExceptionis never returned, only thrown when a certain situation occurs. Also duplicating return values in PHPDoc as well as in the code might lead to outdated code.The current situation confuses PHPStan and one must add custom PHPDoc to "force" a certain behavior.