find folders should validate parent stem name

 if FIND_BY_PARENT_STEM_NAME query filter is given an invalid parentStemName (e.g. typo in path), it still returns SUCCESS but with an empty string. Is this by design, like a non-matching regexp returning 0 matches successfully? I somehow was expecting an error to be returned due to non-existent stem in the path.  this is via WsRestFindStemsRequest by the way