Fix NullPointerException when an integer value no longer occurs in the posterior sample due to burn-in removal
Fix NullPointerException when an integer value no longer occurs in the posterior sample due to burn-in removal

adamallo/beast-mcmc,maxbiostat/beast-mcmc,adamallo/beast-mcmc,4ment/beast-mcmc,beast-dev/beast-mcmc,beast-dev/beast-mcmc,beast-dev/beast-mcmc,maxbiostat/beast-mcmc,4ment/beast-mcmc,4ment/beast-mcmc,adamallo/beast-mcmc,beast-dev/beast-mcmc,4ment/beast-mcmc,adamallo/beast-mcmc,maxbiostat/beast-mcmc,maxbiostat/beast-mcmc,4ment/beast-mcmc,beast-dev/beast-mcmc,beast-dev/beast-mcmc,maxbiostat/beast-mcmc,4ment/beast-mcmc,adamallo/beast-mcmc,adamallo/beast-mcmc,maxbiostat/beast-mcmc