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

@@ -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

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))

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"),