Initialized all member variables in vtkCurveRepresentation
Initialized all member variables in vtkCurveRepresentation

This fixes some valgrind errors about conditionals depending on
uninitialized values.

sankhesh/VTK,demarle/VTK,demarle/VTK,candy7393/VTK,msmolens/VTK,jmerkow/VTK,keithroe/vtkoptix,sankhesh/VTK,keithroe/vtkoptix,sankhesh/VTK,msmolens/VTK,candy7393/VTK,sankhesh/VTK,gram526/VTK,gram526/VTK,mspark93/VTK,gram526/VTK,sumedhasingla/VTK,sumedhasingla/VTK,mspark93/VTK,SimVascular/VTK,mspark93/VTK,demarle/VTK,jmerkow/VTK,jmerkow/VTK,demarle/VTK,sankhesh/VTK,sumedhasingla/VTK,candy7393/VTK,SimVascular/VTK,SimVascular/VTK,msmolens/VTK,mspark93/VTK,sumedhasingla/VTK,msmolens/VTK,sumedhasingla/VTK,mspark93/VTK,candy7393/VTK,sankhesh/VTK,gram526/VTK,candy7393/VTK,SimVascular/VTK,jmerkow/VTK,candy7393/VTK,msmolens/VTK,candy7393/VTK,sankhesh/VTK,jmerkow/VTK,demarle/VTK,msmolens/VTK,msmolens/VTK,sumedhasingla/VTK,gram526/VTK,sankhesh/VTK,demarle/VTK,gram526/VTK,mspark93/VTK,keithroe/vtkoptix,gram526/VTK,jmerkow/VTK,msmolens/VTK,sumedhasingla/VTK,mspark93/VTK,candy7393/VTK,keithroe/vtkoptix,SimVascular/VTK,keithroe/vtkoptix,sumedhasingla/VTK,SimVascular/VTK,jmerkow/VTK,keithroe/vtkoptix,keithroe/vtkoptix,mspark93/VTK,demarle/VTK,demarle/VTK,jmerkow/VTK,SimVascular/VTK,gram526/VTK,SimVascular/VTK,keithroe/vtkoptix