Minor fix to DictColumns.sort
Minor fix to DictColumns.sort

ioam/holoviews,basnijholt/holoviews,ioam/holoviews,vascotenner/holoviews,vascotenner/holoviews,basnijholt/holoviews,vascotenner/holoviews,ioam/holoviews,basnijholt/holoviews