Fix an error when no data is on input or it has no continuous columns.
Fix an error when no data is on input or it has no continuous columns.

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