Fixed bug in pipeline view where modules downstream of an error were green (indicating they were executed).
Fixed bug in pipeline view where modules downstream of an error were
green (indicating they were executed).

core/interpreter/cached.py:
  - CachedInterpreter.unlocked_execute: Check execs[i] to see if it's False



minesense/VisTrails,minesense/VisTrails,Nikea/VisTrails,VisTrails/VisTrails,hjanime/VisTrails,VisTrails/VisTrails,Nikea/VisTrails,celiafish/VisTrails,hjanime/VisTrails,VisTrails/VisTrails,minesense/VisTrails,minesense/VisTrails,Nikea/VisTrails,hjanime/VisTrails,VisTrails/VisTrails,celiafish/VisTrails,hjanime/VisTrails,celiafish/VisTrails,minesense/VisTrails,Nikea/VisTrails,celiafish/VisTrails,VisTrails/VisTrails,hjanime/VisTrails