0051789: TC7.2.0: NoteBook cannot update study

0051789: TC7.2.0: NoteBook cannot update study

Fix for "LayerDistribution" hypothesis

+     * \brief Store a hypothesis wrapping this not published one.
+     *
+     * This hyp, which has no own parameters but is published, is used to store variables
+     * defining parameters of this hypothesis.
+     */
+    void SetHolderHypothesis(in SMESH::SMESH_Hypothesis hyp);

+  // a published hypothesis wrapping this not published one
+  SMESH::SMESH_Hypothesis_var myHolder;