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Found these logs on staging safekeepers:
```
INFO Partial backup{ttid=X/Y}: failed to upload 000000010000000000000000_173_0000000000000000_0000000000000000_sk56.partial: Failed to open file "/storage/safekeeper/data/X/Y/000000010000000000000000.partial" for wal backup: No such file or directory (os error 2)
INFO Partial backup{ttid=X/Y}:upload{name=000000010000000000000000_173_0000000000000000_0000000000000000_sk56.partial}: starting upload PartialRemoteSegment { status: InProgress, name: "000000010000000000000000_173_0000000000000000_0000000000000000_sk56.partial", commit_lsn: 0/0, flush_lsn: 0/0, term: 173 }
```
This is because partial backup tries to upload zero segment when there
is no data in timeline. This PR fixes this bug introduced in #6530.