Sean Harvey 03fb434e59 BUGFIX MigrateSiteTreeLinkingTask returns duplicate results from databases like MSSQL - remove any duplicates that may be around (from r91418)
git-svn-id: svn://svn.silverstripe.com/silverstripe/open/modules/sapphire/trunk@91477 467b73ca-7a2a-4603-9d3b-597d59a354a9
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