update check params code

lib/server.js

@@ -2054,8 +2054,7 @@ WalletService.prototype.getTx = function(opts, cb) {
 WalletService.prototype.editTxNote = function(opts, cb) {
   var self = this;
 
-  if (!Utils.checkRequired(opts, ['txid']))
+  if (!checkRequired(opts, 'txid', cb)) return;
-    return cb(new ClientError('Required argument missing'));
 
   self._runLocked(cb, function(cb) {
     self.storage.fetchTxNote(self.walletId, opts.txid, function(err, note) {
@@ -2084,9 +2083,7 @@ WalletService.prototype.editTxNote = function(opts, cb) {
 WalletService.prototype.getTxNote = function(opts, cb) {
   var self = this;
 
-  if (!Utils.checkRequired(opts, ['txid']))
+  if (!checkRequired(opts, 'txid', cb)) return;
-    return cb(new ClientError('Required argument missing'));
-
   self.storage.fetchTxNote(self.walletId, opts.txid, cb);
 };