Fix new note with empty content not saving to history and remove debug code

lib/history.js

@@ -113,8 +113,7 @@ function setHistory(userid, history) {
 }
 
 function updateHistory(userid, noteId, document) {
-    var t0 = new Date().getTime();
-    if (userid && noteId && document) {
+    if (userid && noteId && typeof document !== 'undefined') {
         getHistory(userid, function (err, history) {
             if (err || !history) return;
             if (!caches[userid].history[noteId]) {
@@ -127,8 +126,6 @@ function updateHistory(userid, noteId, document) {
             noteHistory.time = moment().format('MMMM Do YYYY, h:mm:ss a');
             noteHistory.tags = noteInfo.tags;
             caches[userid].isDirty = true;
-            var t1 = new Date().getTime();
-            console.warn(t1 - t0);
         });
     }
 }