fixed a bug in rview to correctly load the segmentation when there is no source image
fixed a bug in rview to correctly load the segmentation when there is no source image


ghisvail/irtk-legacy,BioMedIA/irtk-legacy,sk1712/IRTK,sk1712/IRTK,ghisvail/irtk-legacy,BioMedIA/irtk-legacy,BioMedIA/IRTK,ghisvail/irtk-legacy,ghisvail/irtk-legacy,BioMedIA/IRTK,BioMedIA/irtk-legacy,sk1712/IRTK,sk1712/IRTK,BioMedIA/IRTK,BioMedIA/IRTK,BioMedIA/irtk-legacy