Fix an error when number of predictor columns is less than max_features.
Fix an error when number of predictor columns is less than max_features.

marinkaz/orange3,qusp/orange3,kwikadi/orange3,qusp/orange3,qusp/orange3,qPCR4vir/orange3,cheral/orange3,marinkaz/orange3,cheral/orange3,qPCR4vir/orange3,cheral/orange3,marinkaz/orange3,cheral/orange3,marinkaz/orange3,qPCR4vir/orange3,qusp/orange3,kwikadi/orange3,marinkaz/orange3,marinkaz/orange3,cheral/orange3,kwikadi/orange3,qPCR4vir/orange3,kwikadi/orange3,qPCR4vir/orange3,cheral/orange3,kwikadi/orange3,qPCR4vir/orange3,kwikadi/orange3