From 9c0568e21ef8acde73e43cd899cf2a74967489b2 Mon Sep 17 00:00:00 2001
From: Malcolm Tredinnick <malcolm.tredinnick@gmail.com>
Date: Tue, 26 Sep 2006 07:26:07 +0000
Subject: [PATCH] Fixed #2208 -- Allow empty arguments to be passed to filters.
 Thanks, mattmcc.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@3852 bcc190cf-cafb-0310-a4f2-bffc1f526a37
---
 AUTHORS                                  | 2 ++
 django/template/__init__.py              | 2 +-
 tests/regressiontests/templates/tests.py | 3 +++
 3 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/AUTHORS b/AUTHORS
index 9621fd8252..fe2b83ac9f 100644
--- a/AUTHORS
+++ b/AUTHORS
@@ -104,7 +104,9 @@ answer newbie questions, and generally made Django that much better:
     Eugene Lazutkin <http://lazutkin.com/blog/>
     Jeong-Min Lee
     Christopher Lenz <http://www.cmlenz.net/>
+    lerouxb@gmail.com
     limodou
+    mattmcc
     Martin Maney <http://www.chipy.org/Martin_Maney>
     Manuzhai
     Petar Marić
diff --git a/django/template/__init__.py b/django/template/__init__.py
index fa75f6c2f5..af8f37a474 100644
--- a/django/template/__init__.py
+++ b/django/template/__init__.py
@@ -532,7 +532,7 @@ class FilterExpression(object):
                 constant_arg, i18n_arg, var_arg = match.group("constant_arg", "i18n_arg", "var_arg")
                 if i18n_arg:
                     args.append((False, _(i18n_arg.replace(r'\"', '"'))))
-                elif constant_arg:
+                elif constant_arg is not None:
                     args.append((False, constant_arg.replace(r'\"', '"')))
                 elif var_arg:
                     args.append((True, var_arg))
diff --git a/tests/regressiontests/templates/tests.py b/tests/regressiontests/templates/tests.py
index 368a46b8fb..e46b715490 100644
--- a/tests/regressiontests/templates/tests.py
+++ b/tests/regressiontests/templates/tests.py
@@ -170,6 +170,9 @@ class Templates(unittest.TestCase):
             # Escaped backslash using known escape char
             'basic-syntax35': (r'{{ var|default_if_none:"foo\now" }}', {"var": None}, r'foo\now'),
 
+            # Empty strings can be passed as arguments to filters
+            'basic-syntax36': (r'{{ var|join:"" }}', {'var': ['a', 'b', 'c']}, 'abc'),
+
             ### COMMENT TAG ###########################################################
             'comment-tag01': ("{% comment %}this is hidden{% endcomment %}hello", {}, "hello"),
             'comment-tag02': ("{% comment %}this is hidden{% endcomment %}hello{% comment %}foo{% endcomment %}", {}, "hello"),