fix(thconcept): Correct access to undefined index in recomputeRelations() (refs #4764)
feat(SearchDoc): Add \Dcp\DocumentFilter\Thesaurus* classes (refs #4769)
Merge pull request #16 from eguaj/1.2-A4764

feat(SearchDoc): Add \Dcp\DocumentFilter\Thesaurus* classes (closes #4764)(closes #4769)