From fe5c61104f9faf5915581ce5299a69fabc9d7bbc Mon Sep 17 00:00:00 2001
From: David Greenspan <dgreenspan@alum.mit.edu>
Date: Wed, 24 Sep 2014 16:39:33 -0700
Subject: [PATCH] Fix falsy helpers (like `0`)

---
 packages/blaze/lookup.js                     | 2 +-
 packages/spacebars-tests/template_tests.html | 4 ++++
 packages/spacebars-tests/template_tests.js   | 9 +++++++++
 3 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/packages/blaze/lookup.js b/packages/blaze/lookup.js
index 2d0ffc0a88..1032d5a691 100644
--- a/packages/blaze/lookup.js
+++ b/packages/blaze/lookup.js
@@ -64,7 +64,7 @@ Blaze.View.prototype.lookup = function (name, _options) {
   } else if (lookupTemplate && (name in Blaze.Template) &&
              (Blaze.Template[name] instanceof Blaze.Template)) {
     return Blaze.Template[name];
-  } else if (Blaze._globalHelpers[name]) {
+  } else if (Blaze._globalHelpers[name] != null) {
     return wrapHelper(bindDataContext(Blaze._globalHelpers[name]));
   } else {
     return function () {
diff --git a/packages/spacebars-tests/template_tests.html b/packages/spacebars-tests/template_tests.html
index 0295b86ddb..c3faed9d51 100644
--- a/packages/spacebars-tests/template_tests.html
+++ b/packages/spacebars-tests/template_tests.html
@@ -992,3 +992,7 @@ Hi there!
     {{/with}}
   {{/with}}
 </template>
+
+<template name="spacebars_template_test_falsy_helper">
+  foo:{{foo}} GLOBAL_ZERO:{{GLOBAL_ZERO}}
+</template>
diff --git a/packages/spacebars-tests/template_tests.js b/packages/spacebars-tests/template_tests.js
index 609c15fe67..25b40b17b5 100644
--- a/packages/spacebars-tests/template_tests.js
+++ b/packages/spacebars-tests/template_tests.js
@@ -2903,3 +2903,12 @@ Tinytest.add("spacebars-tests - template_tests - content context back-compat", f
   Tracker.flush();
   test.equal(canonicalizeHtml(div.innerHTML), 'FA');
 });
+
+Tinytest.add("spacebars-tests - template_tests - falsy helper", function (test) {
+  var tmpl = Template.spacebars_template_test_falsy_helper;
+  tmpl.foo = 0;
+  Template.registerHelper('GLOBAL_ZERO', 0);
+
+  var div = renderToDiv(tmpl);
+  test.equal(canonicalizeHtml(div.innerHTML), 'foo:0 GLOBAL_ZERO:0');
+});