Fixed #4558 -- Modified XML serializer to handle whitespace better around None tags. Thanks to Bill Fenner <fenner@gmail.com> for the report and fix.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@5727 bcc190cf-cafb-0310-a4f2-bffc1f526a37

tests/regressiontests/fixtures_regress/fixtures/pretty.xml

@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="utf-8"?>
+<django-objects version="1.0">
+  <object pk="1" model="fixtures_regress.stuff">
+    <field type="CharField" name="name">
+      <None/>
+    </field>
+    <field to="auth.user" name="owner" rel="ManyToOneRel">
+      <None/>
+    </field>
+  </object>
+</django-objects>

tests/regressiontests/fixtures_regress/models.py

@@ -1,4 +1,5 @@
 from django.db import models
+from django.contrib.auth.models import User
 
 class Animal(models.Model):
     name = models.CharField(maxlength=150)
@@ -14,6 +15,13 @@ class Plant(models.Model):
         # For testing when upper case letter in app name; regression for #4057
         db_table = "Fixtures_regress_plant"
 
+class Stuff(models.Model):
+    name = models.CharField(maxlength=20, null=True)
+    owner = models.ForeignKey(User, null=True)
+    
+    def __unicode__(self):
+        return unicode(self.name) + u' is owned by ' + unicode(self.owner)
+
 __test__ = {'API_TESTS':"""
 >>> from django.core import management
 
@@ -26,4 +34,13 @@ __test__ = {'API_TESTS':"""
 >>> animal = Animal(name='Platypus', latin_name='Ornithorhynchus anatinus')
 >>> animal.save()
 
+###############################################
+# Regression test for ticket #4558 -- pretty printing of XML fixtures
+# doesn't affect parsing of None values.
+
+# Load a pretty-printed XML fixture with Nulls.
+>>> management.load_data(['pretty.xml'], verbosity=0)
+>>> Stuff.objects.all()
+[<Stuff: None is owned by None>]
+
 """}