Fix MultipoleProfileTask such that it won't compute a whole spectrum of mfps.
Fix MultipoleProfileTask such that it won't compute a whole spectrum of mfps.

patwonder/pbrt-v2-skin,patwonder/pbrt-v2-skin,patwonder/pbrt-v2-skin,patwonder/pbrt-v2-skin,patwonder/pbrt-v2-skin