exclude empty ranges for RESTORE and REVERT #86
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Changing tables and columns multiple times during one transaction produces entries in log tables with
emptytxid_range. As noted in #81. In many cases this is covered by querying both the upper (NULL) and lower (NOT NULL) boundary of the range. But it was still missing in a few essential places, e.g. for restoring, reverting transactions,audit_tablesview.