[BUGFIX] Delete index documents without available site #3770
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This PR fixes a bug where an index document does not a have a site object assigned. In this case, the index document can be safely removed.
Since this bug occurred in a TYPO3 v11.5 environment, the PR should be backported to the 11.5.x branch.
Resolves: #3769
Releases: main, 11.5