[BUGFIX:BP:11.5] Fix handling of non existing pages on deletions #3520
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What this pr does
If a records page or the site root is not available exceptions will occur during garbage collection. This commit improves
the handling of missing pages to fix this issue.
How to test
Try to delete a record without a proper page tree connection via DataHandler, e.g. use a deleted site root or a deleted record
storage.
Fixes: #3500