Don't use isnan directly since it isn't available on VisStudio.
Don't use isnan directly since it isn't available on VisStudio.

Change-Id: Ia1d07bd803e31baf5ed6848888fbb3fb50316fdc

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