ENH: PrintSelf improvements to avoid segfaults when projections are not initialized

Code/BasicFilters/otbStreamingResampleImageFilter.h

Code/BasicFilters/otbStreamingResampleImageFilter.txx

Code/IO/otbDEMToOrthoImageGenerator.txx

Code/Projections/otbGenericMapProjection.h

Code/Projections/otbGenericMapProjection.txx

Code/Projections/otbGenericRSResampleImageFilter.h

Code/Projections/otbGenericRSResampleImageFilter.txx

Code/Projections/otbGenericRSTransform.h

Code/Projections/otbGenericRSTransform.txx

Code/Projections/otbMapProjection.h

Testing/Code/Projections/otbGenericRSResampleImageFilter.cxx