Fix bug 581: remove useless piece of code is blueNorm
(transplanted from 72a7ce1bca6d88fb4bc788be628925bebdf0e037)

--HG--
branch : 3.1
extra : transplant_source : r%A7%CE%1B%CAm%88%FBK%C7%88%BEb%89%25%BE%BD%F0%E07