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Fix exception when Group relation is empty

Vasilii Iakliushin requested to merge 366741_fix_group_preload_for_empty_relation into master

What does this MR do and why?

Contributes to #366741 (closed). I discovered this problem while testing the feature flag: #366741 (comment 1019275532)

Problem

The ancestor query has invalid syntax when the relation is empty.

Solution

Skip preloading for empty relations

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