BUG: Fix undefined cases when largest eigen value is computed to be zero
BUG: Fix undefined cases when largest eigen value is computed to be zero

thewtex/TubeTK,matthieuheitz/TubeTK,cdeepakroy/TubeTK,KitwareMedical/TubeTK,aylward/ITKTubeTK,sumedhasingla/TubeTK,aylward/ITKTubeTK,sumedhasingla/TubeTK,KitwareMedical/ITKTubeTK,KitwareMedical/TubeTK,KitwareMedical/ITKTubeTK,aylward/ITKTubeTK,KitwareMedical/ITKTubeTK,sumedhasingla/TubeTK,KitwareMedical/TubeTK,thewtex/TubeTK,LucasGandel/TubeTK,thewtex/TubeTK,KitwareMedical/ITKTubeTK,cdeepakroy/TubeTK,cdeepakroy/TubeTK,matthieuheitz/TubeTK,thewtex/TubeTK,aylward/ITKTubeTK,LucasGandel/TubeTK,sumedhasingla/TubeTK,LucasGandel/TubeTK,matthieuheitz/TubeTK,KitwareMedical/TubeTK,LucasGandel/TubeTK,cdeepakroy/TubeTK,matthieuheitz/TubeTK