fix(CalDAV): initialise properties to avoid access before initialisation errors · nextcloud/server@d7bf40e

apps/admin_audit/lib/Actions/Action.php:62:16: TaintedHtml: Detected tainted HTML (see https://psalm.dev/245)

apps/files_external/lib/Config/ConfigAdapter.php:85:50: TaintedCallable: Detected tainted text (see https://psalm.dev/243)

apps/files_external/lib/Lib/Storage/SFTP.php:237:17: TaintedFile: Detected tainted file handling (see https://psalm.dev/255)

apps/files_external/lib/Lib/Storage/SFTP.php:258:19: TaintedFile: Detected tainted file handling (see https://psalm.dev/255)

apps/files_external/lib/Lib/Storage/SFTP.php:399:22: TaintedFile: Detected tainted file handling (see https://psalm.dev/255)

apps/files_sharing/lib/Controller/ShareController.php:462:35: TaintedCookie: Detected tainted cookie (see https://psalm.dev/257)

apps/theming/lib/IconBuilder.php:137:40: TaintedFile: Detected tainted file handling (see https://psalm.dev/255)

apps/theming/lib/IconBuilder.php:235:28: TaintedFile: Detected tainted file handling (see https://psalm.dev/255)

lib/base.php:206:12: TaintedHeader: Detected tainted header (see https://psalm.dev/256)

lib/base.php:288:12: TaintedHeader: Detected tainted header (see https://psalm.dev/256)

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