plotVolcano_life produces error message with peptide data

[MarekGierlinski]

library(proteusUnlabelled)
data(proteusUnlabelled)
res <- limmaDE(pepdat.clean)
plotVolcano_live(pepdat.clean, res)

Instead of peptide table at the bottom, there is an error message (undefined columns selected).

[MarekGierlinski]

Fixed.