COMP: Fix unused warning related to vtkMRMLWriteXML and vtkMRMLPrint

phcerdanrequested to merge
github/fork/phcerdan/fix_warning_unused_macro_display_node into master

in vtkMRMLGPURayCastVolumeRenderingDisplayNode and vtkMRMLMultiVolumeRenderingDisplayNode.

These classes where starting and end the macros, but without any content printed or written between those calls.

Warning:

[335/2622] Building CXX object Libs/vtkITK/CMakeFiles/vtkITK.dir/vtkITKGrowCutSegmentationImageFilter.cxx.o
In file included from Libs/MRML/Core/vtkMRMLNode.h:37,
                 from Libs/MRML/Core/vtkMRMLDisplayNode.h:19,
                 from Modules/Loadable/VolumeRendering/MRML/vtkMRMLVolumeRenderingDisplayNode.h:22,
                 from Modules/Loadable/VolumeRendering/MRML/vtkMRMLGPURayCastVolumeRenderingDisplayNode.h:25,
                 from Modules/Loadable/VolumeRendering/MRML/vtkMRMLGPURayCastVolumeRenderingDisplayNode.cxx:22:
Modules/Loadable/VolumeRendering/MRML/vtkMRMLGPURayCastVolumeRenderingDisplayNode.cxx: In member function ‘virtual void vtkMRMLGPURayCastVolumeRenderingDisplayNode::ReadXMLAttributes(const char**)’:
Libs/MRML/Core/vtkMRMLNodePropertyMacros.h:148:15: warning: variable ‘xmlReadAttName’ set but not used [-Wunused-but-set-variable]
   const char* xmlReadAttName; \
               ^~~~~~~~~~~~~~
Modules/Loadable/VolumeRendering/MRML/vtkMRMLGPURayCastVolumeRenderingDisplayNode.cxx:48:3: note: in expansion of macro ‘vtkMRMLReadXMLBeginMacro’
   vtkMRMLReadXMLBeginMacro(atts);
   ^~~~~~~~~~~~~~~~~~~~~~~~
In file included from Libs/MRML/Core/vtkMRMLNode.h:37,
                 from Libs/MRML/Core/vtkMRMLDisplayNode.h:19,
                 from Modules/Loadable/VolumeRendering/MRML/vtkMRMLVolumeRenderingDisplayNode.h:22,
                 from Modules/Loadable/VolumeRendering/MRML/vtkMRMLGPURayCastVolumeRenderingDisplayNode.h:25,
                 from Modules/Loadable/VolumeRendering/MRML/vtkMRMLGPURayCastVolumeRenderingDisplayNode.cxx:22:
Modules/Loadable/VolumeRendering/MRML/vtkMRMLGPURayCastVolumeRenderingDisplayNode.cxx: In member function ‘virtual void vtkMRMLGPURayCastVolumeRenderingDisplayNode::WriteXML(std::ostream&, int)’:
Libs/MRML/Core/vtkMRMLNodePropertyMacros.h:30:12: warning: unused variable ‘xmlWriteOutputStream’ [-Wunused-variable]
   ostream& xmlWriteOutputStream = of;
            ^~~~~~~~~~~~~~~~~~~~
Modules/Loadable/VolumeRendering/MRML/vtkMRMLGPURayCastVolumeRenderingDisplayNode.cxx:57:3: note: in expansion of macro ‘vtkMRMLWriteXMLBeginMacro’
   vtkMRMLWriteXMLBeginMacro(of);
   ^~~~~~~~~~~~~~~~~~~~~~~~~
In file included from Libs/MRML/Core/vtkMRMLNode.h:37,
                 from Libs/MRML/Core/vtkMRMLDisplayNode.h:19,
                 from Modules/Loadable/VolumeRendering/MRML/vtkMRMLVolumeRenderingDisplayNode.h:22,
                 from Modules/Loadable/VolumeRendering/MRML/vtkMRMLGPURayCastVolumeRenderingDisplayNode.h:25,
                 from Modules/Loadable/VolumeRendering/MRML/vtkMRMLGPURayCastVolumeRenderingDisplayNode.cxx:22:
Modules/Loadable/VolumeRendering/MRML/vtkMRMLGPURayCastVolumeRenderingDisplayNode.cxx: In member function ‘virtual void vtkMRMLGPURayCastVolumeRenderingDisplayNode::PrintSelf(std::ostream&, vtkIndent)’:
Libs/MRML/Core/vtkMRMLNodePropertyMacros.h:417:12: warning: unused variable ‘printOutputStream’ [-Wunused-variable]
   ostream& printOutputStream = os; \
            ^~~~~~~~~~~~~~~~~
Modules/Loadable/VolumeRendering/MRML/vtkMRMLGPURayCastVolumeRenderingDisplayNode.cxx:78:3: note: in expansion of macro ‘vtkMRMLPrintBeginMacro’
   vtkMRMLPrintBeginMacro(os, indent);
   ^~~~~~~~~~~~~~~~~~~~~~
Libs/MRML/Core/vtkMRMLNodePropertyMacros.h:418:13: warning: variable ‘printOutputIndent’ set but not used [-Wunused-but-set-variable]
   vtkIndent printOutputIndent = indent;
             ^~~~~~~~~~~~~~~~~
Modules/Loadable/VolumeRendering/MRML/vtkMRMLGPURayCastVolumeRenderingDisplayNode.cxx:78:3: note: in expansion of macro ‘vtkMRMLPrintBeginMacro’
   vtkMRMLPrintBeginMacro(os, indent);

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