Use container's empty method instead of size == 0.

Applications/DataExplorer/DataView/StratView/StratScene.cpp

Applications/DataExplorer/VtkVis/VtkPointsSource.cpp

Applications/DataExplorer/VtkVis/VtkPolylinesSource.cpp

Applications/DataExplorer/VtkVis/VtkStationSource.cpp

Applications/DataExplorer/VtkVis/VtkSurfacesSource.cpp

Applications/DataExplorer/VtkVis/VtkVisTabWidget.cpp

Applications/DataExplorer/mainwindow.cpp

Applications/FileIO/PetrelInterface.cpp

GeoLib/IO/Legacy/OGSIOVer4.cpp

GeoLib/StationBorehole.cpp

ProcessLib/GroundwaterFlow/GroundwaterFlowFEM.h

ProcessLib/HT/CreateHTProcess.cpp

ProcessLib/HT/HTFEM.h

ProcessLib/HeatConduction/HeatConductionFEM.h

ProcessLib/HydroMechanics/HydroMechanicsFEM.h

ProcessLib/LiquidFlow/LiquidFlowLocalAssembler.h

ProcessLib/RichardsFlow/RichardsFlowFEM.h

ProcessLib/TES/TESReactionAdaptor.cpp

...ib/TwoPhaseFlowWithPP/CreateTwoPhaseFlowWithPPProcess.cpp

...Lib/TwoPhaseFlowWithPP/TwoPhaseFlowWithPPLocalAssembler.h