Missing channels in Phenograph cluster

[laufre]

Hi, I'm experiencing the issue, that if all cells in one sample have the value = 0 for a channel, this channel cannot be selected for e.g. Phenograph. Is there a workaround, allowing me to select a channel for Phenograph, even though one sample out of many is completely = 0 for this marker? (essentially the same issue mentioned here: http://imc-forum.org/viewtopic.php?f=4&t=98) However, in my case all cells being zero for a given marker is not due to bad data quality but intended.

Your help would be very much appreciated!