ensure showBlockStats is set for new Accounts

bubble-server/src/main/java/bubble/dao/account/AccountDAO.java

@@ -108,6 +108,7 @@ public class AccountDAO extends AbstractCRUDDAO<Account> implements SqlViewSearc
 
     @Override public Object preCreate(Account account) {
         if (!account.hasLocale()) account.setLocale(getDEFAULT_LOCALE());
+        account.setShowBlockStats(account.showBlockStats());  // ensure non-null
 
         // check account limit for plan, if there is a plan
         final BubblePlan plan = selfNodeService.getThisPlan();