from preamble:

"Change Set:		ChangeSorter-removeEmpty-dgd
Date:			27 July 2002
Author:			Diego Gomez Deck <DiegoGomezDeck at ConsultAr.com>

ChangeSorter class>>removeEmptyChangeSets

Remove all change sets that are empty and which are not nailed down by
belonging to a Project.

based on ChangeSorter class>>removeEmptyUnnamedChangeSets
"!
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