BUG : foamToEnsight -faceZones still crashes sometimes in develop

Possibly related to #317 (closed), foamToEnsight -faceZones still crashes sometimes. I tested with the latest develop commit.

The example model is attached and is a simple pipe with a few faceZones and a cellZone created during meshing. When foamToEnsight -faceZones is run at the end, it crashes and goes into a large loop of errors.