Did you mean that no one chanted the Ite Missa Est?
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Isn’t it the priest who says that the Mass is ended?
At a low Mass (Missa Lecta) and a sung High Mass (Missa Cantata) the priest says or chants the Ite Missa est, respectively. However, at a Solemn High Mass I am reasonably certain that the celebrant (the main priest - most Solemn High Masses these days have three priests as ministers: the celebrant, deacon and subdeacon) does not chant the Ite Missa est.