Remove unused exception variables in catch blocks

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This fixes warnings like:

D:\a\1\s\io\src\lzf_image_io.cpp(190): warning C4101: 'e': unreferenced local variable [D:\a\build\io\pcl_io.vcxproj]
D:\a\1\s\io\src\lzf_image_io.cpp(209): warning C4101: 'e': unreferenced local variable [D:\a\build\io\pcl_io.vcxproj]
D:\a\1\s\io\src\lzf_image_io.cpp(269): warning C4101: 'e': unreferenced local variable [D:\a\build\io\pcl_io.vcxproj]

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Fix worked, Azure shows now only 2 warnings of unreferenced local variable instead if 14. Both remaining warnings are in 3rd-Party code.