Fix error reading "last" property during reindex

lib/database.js

@@ -336,6 +336,7 @@ module.exports = {
   create_stats: function(coin, cb) {
     var newStats = new Stats({
       coin: coin,
+      last: 0
     });
 
     newStats.save(function(err) {
@@ -782,6 +783,9 @@ module.exports = {
           }, {
             new: true
           }, function(err, new_stats) {
+            if(err) {
+              console.log("Error during Stats Update:", err);
+            }
             return cb({coin: coin,
               count : count,
               supply: supply,