From 7d70ea9ecd9bb8f758b5d9bdd3bfea28b65c0423 Mon Sep 17 00:00:00 2001
From: Connor Turland <connorturland@gmail.com>
Date: Thu, 6 Oct 2016 09:07:02 -0400
Subject: [PATCH] account for case where callback isn't provided

---
 frontend/src/Metamaps/Synapse.js | 3 ++-
 frontend/src/Metamaps/Topic.js   | 4 ++--
 2 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/frontend/src/Metamaps/Synapse.js b/frontend/src/Metamaps/Synapse.js
index 29fcc790..8253d6ba 100644
--- a/frontend/src/Metamaps/Synapse.js
+++ b/frontend/src/Metamaps/Synapse.js
@@ -19,10 +19,11 @@ import Visualize from './Visualize'
  *  - Metamaps.Topics
  */
 
+const noOp = () => {}
 const Synapse = {
   // this function is to retrieve a synapse JSON object from the database
   // @param id = the id of the synapse to retrieve
-  get: function (id, callback) {
+  get: function (id, callback = noOp) {
     // if the desired topic is not yet in the local topic repository, fetch it
     if (Metamaps.Synapses.get(id) == undefined) {
       $.ajax({
diff --git a/frontend/src/Metamaps/Topic.js b/frontend/src/Metamaps/Topic.js
index 7632eb01..5be6cc57 100644
--- a/frontend/src/Metamaps/Topic.js
+++ b/frontend/src/Metamaps/Topic.js
@@ -28,11 +28,11 @@ import Visualize from './Visualize'
  *  - Metamaps.Synapses
  *  - Metamaps.Topics
  */
-
+const noOp = () => {}
 const Topic = {
   // this function is to retrieve a topic JSON object from the database
   // @param id = the id of the topic to retrieve
-  get: function (id, callback) {
+  get: function (id, callback = noOp) {
     // if the desired topic is not yet in the local topic repository, fetch it
     if (Metamaps.Topics.get(id) == undefined) {
       $.ajax({