[core] Bug Fix for mcfcPNG
[core] Bug Fix for mcfcPNG

openconnectome/open-connectome,neurodata/ndstore,openconnectome/open-connectome,openconnectome/open-connectome,openconnectome/open-connectome,neurodata/ndstore,openconnectome/open-connectome,neurodata/ndstore,neurodata/ndstore,openconnectome/open-connectome