ChIA-pet vis-def caused an assert, because view groups were referenced that were not defined.
ChIA-pet vis-def caused an assert, because view groups were referenced that were not defined.

T2DREAM/t2dream-portal,ENCODE-DCC/encoded,ENCODE-DCC/encoded,ENCODE-DCC/encoded,T2DREAM/t2dream-portal,T2DREAM/t2dream-portal,ENCODE-DCC/encoded,T2DREAM/t2dream-portal