refs #618, clang fixes

* use own default constructor error: default initialization of an object of const type 'const BlackMisc::CIcon' without a user-provided default constructor static const CIcon empty;
* same for CDbOwnModelsComponent()
* fixed guard

src/blackgui/components/data/lastselections.h

@@ -35,6 +35,9 @@ namespace BlackGui
                     IndexLastSimulator = BlackMisc::CPropertyIndex::GlobalIndexCDbOwnModelsComponent
                 };
 
+                //! Constructor
+                CDbOwnModelsComponent() {}
+
                 //! Simulator last selected
                 const BlackMisc::Simulation::CSimulatorInfo &getLastSimulatorSelection() const { return m_simulator; }