Handle Pandoc presence or absence in a more graceful manner.
Handle Pandoc presence or absence in a more graceful manner.

The previous version tried to call `pandoc --version` but if one doesn't even have pandoc installed, you get an error-based exit from rake. Instead, now, we wrap in a Ruby begin ... rescue clause to more gracefully handle the possibility that Pandoc isn't installed yet.

cse-sim/cse,cse-sim/cse