Nuke ChromaValue bugfix artifacts with negative pixels near zero.

Author: jedypod

look-transforms/tools/nuke/ChromaValue.nk

@@ -89,7 +89,7 @@ push $Nc5615a90
   temp_expr3 (H+o)%6
   channel0 {rgba.red rgba.green rgba.blue none}
   expr0 h<cn?clamp((h-e0)/(cn-e0)):clamp((h-e1)/(cn-e1))
-  expr3 M==0?0:C/M
+  expr3 M<=0?0:C/M
   name HueAngle
   xpos -260
   ypos -682

look-transforms/tools/nuke/n6ChromaValue.nk

@@ -87,7 +87,7 @@ push $N22c03760
   temp_expr1 M-min(r,g,b)
   channel0 {rgba.red rgba.green rgba.blue none}
   expr0 (C==0?0:r==M?((g-b)/C+6)%6:g==M?(b-r)/C+2:b==M?(r-g)/C+4:0)
-  expr3 M==0?0:C/M
+  expr3 M<=0?0:C/M
   name hue
   xpos -260
   ypos 350