fix bug PAL10974: check if SubMeshesComputed() by presence of nodes in submesh. Restore lost modifications fixing PAL8021.
fix bug PAL10974: check if SubMeshesComputed() by presence of nodes in submesh.
Restore lost modifications fixing PAL8021.

FedoraScientific/salome-smesh,FedoraScientific/salome-smesh,FedoraScientific/salome-smesh,FedoraScientific/salome-smesh