Fix for a bug: if ViewModel does not support Trihedron in its views, then a corresponding Action is not created in createActions().  BUT it was used without checking in the next function - createToolBar().  Added a check for myModel->trihedronActivated() to createToolBar().
Fix for a bug: if ViewModel does not support Trihedron in its views, then a corresponding Action is not created in createActions().  BUT it was used without checking in the next function - createToolBar().  Added a check for myModel->trihedronActivated() to createToolBar().

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