Bug fix: Splitter without area was hided even it contains another visible splitters
Bug fix: Splitter without area was hided even it contains another visible splitters

FedoraScientific/salome-gui,FedoraScientific/salome-gui,FedoraScientific/salome-gui,FedoraScientific/salome-gui,FedoraScientific/salome-gui,FedoraScientific/salome-gui