BUG: Check for edge condition in vtkMergeGraph to avoid seg fault.
BUG: Check for edge condition in vtkMergeGraph to avoid seg fault.

spthaolt/VTK,collects/VTK,sankhesh/VTK,sumedhasingla/VTK,berendkleinhaneveld/VTK,biddisco/VTK,collects/VTK,msmolens/VTK,SimVascular/VTK,johnkit/vtk-dev,msmolens/VTK,mspark93/VTK,gram526/VTK,jmerkow/VTK,naucoin/VTKSlicerWidgets,daviddoria/PointGraphsPhase1,berendkleinhaneveld/VTK,Wuteyan/VTK,sumedhasingla/VTK,biddisco/VTK,daviddoria/PointGraphsPhase1,Wuteyan/VTK,msmolens/VTK,hendradarwin/VTK,sankhesh/VTK,biddisco/VTK,Wuteyan/VTK,msmolens/VTK,spthaolt/VTK,jeffbaumes/jeffbaumes-vtk,naucoin/VTKSlicerWidgets,candy7393/VTK,daviddoria/PointGraphsPhase1,johnkit/vtk-dev,keithroe/vtkoptix,berendkleinhaneveld/VTK,hendradarwin/VTK,SimVascular/VTK,keithroe/vtkoptix,ashray/VTK-EVM,jmerkow/VTK,mspark93/VTK,gram526/VTK,arnaudgelas/VTK,msmolens/VTK,berendkleinhaneveld/VTK,sankhesh/VTK,Wuteyan/VTK,keithroe/vtkoptix,keithroe/vtkoptix,Wuteyan/VTK,collects/VTK,ashray/VTK-EVM,keithroe/vtkoptix,johnkit/vtk-dev,mspark93/VTK,candy7393/VTK,msmolens/VTK,aashish24/VTK-old,arnaudgelas/VTK,demarle/VTK,johnkit/vtk-dev,candy7393/VTK,cjh1/VTK,collects/VTK,ashray/VTK-EVM,sankhesh/VTK,gram526/VTK,demarle/VTK,sumedhasingla/VTK,jmerkow/VTK,jmerkow/VTK,jeffbaumes/jeffbaumes-vtk,naucoin/VTKSlicerWidgets,SimVascular/VTK,SimVascular/VTK,collects/VTK,arnaudgelas/VTK,gram526/VTK,biddisco/VTK,ashray/VTK-EVM,gram526/VTK,SimVascular/VTK,daviddoria/PointGraphsPhase1,naucoin/VTKSlicerWidgets,jeffbaumes/jeffbaumes-vtk,sumedhasingla/VTK,biddisco/VTK,naucoin/VTKSlicerWidgets,keithroe/vtkoptix,arnaudgelas/VTK,ashray/VTK-EVM,aashish24/VTK-old,gram526/VTK,spthaolt/VTK,demarle/VTK,hendradarwin/VTK,candy7393/VTK,spthaolt/VTK,candy7393/VTK,collects/VTK,keithroe/vtkoptix,cjh1/VTK,aashish24/VTK-old,spthaolt/VTK,cjh1/VTK,sankhesh/VTK,jeffbaumes/jeffbaumes-vtk,hendradarwin/VTK,keithroe/vtkoptix,mspark93/VTK,naucoin/VTKSlicerWidgets,candy7393/VTK,mspark93/VTK,biddisco/VTK,SimVascular/VTK,ashray/VTK-EVM,SimVascular/VTK,candy7393/VTK,hendradarwin/VTK,jmerkow/VTK,cjh1/VTK,cjh1/VTK,johnkit/vtk-dev,mspark93/VTK,mspark93/VTK,jmerkow/VTK,jmerkow/VTK,jeffbaumes/jeffbaumes-vtk,ashray/VTK-EVM,mspark93/VTK,hendradarwin/VTK,johnkit/vtk-dev,sumedhasingla/VTK,spthaolt/VTK,jeffbaumes/jeffbaumes-vtk,demarle/VTK,sankhesh/VTK,spthaolt/VTK,sumedhasingla/VTK,gram526/VTK,daviddoria/PointGraphsPhase1,johnkit/vtk-dev,berendkleinhaneveld/VTK,sankhesh/VTK,daviddoria/PointGraphsPhase1,msmolens/VTK,demarle/VTK,Wuteyan/VTK,jmerkow/VTK,berendkleinhaneveld/VTK,arnaudgelas/VTK,aashish24/VTK-old,demarle/VTK,candy7393/VTK,gram526/VTK,ashray/VTK-EVM,sumedhasingla/VTK,msmolens/VTK,cjh1/VTK,berendkleinhaneveld/VTK,sankhesh/VTK,aashish24/VTK-old,demarle/VTK,demarle/VTK,aashish24/VTK-old,arnaudgelas/VTK,Wuteyan/VTK,sumedhasingla/VTK,biddisco/VTK,SimVascular/VTK,hendradarwin/VTK