Fix parsing bug when select, simulate, and infer were called without HIST
Fix parsing bug when select, simulate, and infer were called without HIST

poppingtonic/BayesDB,JDReutt/BayesDB,JDReutt/BayesDB,poppingtonic/BayesDB,JDReutt/BayesDB,JDReutt/BayesDB,JDReutt/BayesDB,poppingtonic/BayesDB,poppingtonic/BayesDB,poppingtonic/BayesDB