From 8e60cf01deeae8b1fcf99d44a4a1925c8657d9f9 Mon Sep 17 00:00:00 2001
From: Ivan Socolsky <jungans@gmail.com>
Date: Thu, 13 Apr 2017 12:35:15 -0300
Subject: [PATCH] avoid storing empty collection

---
 lib/storage.js | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/lib/storage.js b/lib/storage.js
index b6e35fd..0132aa0 100644
--- a/lib/storage.js
+++ b/lib/storage.js
@@ -463,6 +463,13 @@ Storage.prototype.storeAddress = function(address, cb) {
 Storage.prototype.storeAddressAndWallet = function(wallet, addresses, cb) {
   var self = this;
 
+  function saveAddresses(addresses, cb) {
+    if (_.isEmpty(addresses)) return cb();
+    self.db.collection(collections.ADDRESSES).insert(addresses, {
+      w: 1
+    }, cb);
+  };
+
   var addresses = [].concat(addresses);
   if (addresses.length == 0) return cb();
 
@@ -484,9 +491,7 @@ Storage.prototype.storeAddressAndWallet = function(wallet, addresses, cb) {
     if (newAddresses.length < addresses.length) {
       log.warn('Attempted to store already existing addresses on wallet ' + wallet.id);
     }
-    self.db.collection(collections.ADDRESSES).insert(newAddresses, {
-      w: 1
-    }, function(err) {
+    saveAddresses(newAddresses, function(err) {
       if (err) return cb(err);
       self.storeWallet(wallet, cb);
     });