fix setup.py to handle case where pypandoc throws OSError if not installed correctly.
fix setup.py to handle case where pypandoc throws OSError if not installed correctly.

concentricsky/badgecheck,openbadges/badgecheck,IMSGlobal/openbadges-validator-core,concentricsky/badgecheck,openbadges/badgecheck,IMSGlobal/openbadges-validator-core