One hoped and expected there would be performances of Pierre Boulez pieces in Boston this season to honor this great musician who died last winter. The Berlin Philharmonic, hardly a local group, will play one piece on its visit here in November. I don’t see anything else on the horizon. So, many thanks to Boston Musica Viva, our fine contemporary music ensemble now in its 48th year, for opening its season with Boulez’s perhaps most significant work, Le Marteau sans maître (The Hammer without a Master, 1954-57).