From d39e4749bd1a68799fd0f37e11d641d4c93f8712 Mon Sep 17 00:00:00 2001
From: Kevin Yang <kyang@salsify.com>
Date: Wed, 30 Nov 2016 15:33:52 -0500
Subject: [PATCH] Handle undefined local-class (#57)

* handle undefined local-class case

* add test
---
 addon/helpers/local-class.js           | 2 +-
 tests/unit/helpers/local-class-test.js | 4 ++++
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/addon/helpers/local-class.js b/addon/helpers/local-class.js
index db150d4b..cfdd12b8 100644
--- a/addon/helpers/local-class.js
+++ b/addon/helpers/local-class.js
@@ -5,7 +5,7 @@ export function localClass(params, hash) {
   if (!hash.from) { return ''; }
 
   let styles = resolveSource(hash.from);
-  let classes = params[0].split(/\s+/);
+  let classes = (params[0] || '').split(/\s+/);
 
   return classes.map(style => styles[style]).filter(Boolean).join(' ');
 }
diff --git a/tests/unit/helpers/local-class-test.js b/tests/unit/helpers/local-class-test.js
index a410bdd5..c7902c2b 100644
--- a/tests/unit/helpers/local-class-test.js
+++ b/tests/unit/helpers/local-class-test.js
@@ -48,6 +48,10 @@ test('with an empty source specified', function(assert) {
   assert.equal(localClass(['abc'], { from: null }), '');
 });
 
+test('with an undefined local class', function(assert) {
+  assert.equal(localClass([undefined], { from: null }), '');
+});
+
 export default { foo: '_foo_123', bar: '_bar_789' };
 
 test('with a string source specified', function(assert) {