LPS-36641 Fix CE Compat - StringPool doesn't have NULL_CHAR
LPS-33207 Fix CE Compat - Copy BaseIndexer#addSearchAssetCategoryTitles from Portal
LPS-35416 Fix CE Compat - nullSafeGetIndexer returns a dummyIndexer if null, we don't need one because all we do is skip reindex if null
LPS-35998 Fix CE Compat - Move UniqueList from Portal
LPS-33207 Why not call it add, like in master?