Breaking: #82852 - Exception is thrown on invalid charset

See Issue #82852

Description

The method \TYPO3\CMS\Core\Charset\CharsetConverter::initCharset() and consequently all methods in this class calling that method now throw an \TYPO3\CMS\Core\Charset\UnknownCharsetException if an unknown charset was provided.

The TypoScriptFrontendController aka TSFE uses this to throw a \RuntimeException in case of an invalid config.metaCharset. Before this resulted in a blank page instead.

Impact

Third party code directly using the CharsetConverter class need to be aware of the new exception in case of an invalid charset.

Sites with an invalid config.metaCharset will now see a clear error message.

Migration

Catch the UnknownCharsetException of the CharsetConverter if necessary.

Ensure that config.metaCharset is set to a known charset.