Allow message to be saved without attachments.

django_mailbox/models.py

@@ -256,7 +256,10 @@ class Message(models.Model):
         null=True,
     )
 
-    attachments = models.ManyToManyField(MessageAttachment)
+    attachments = models.ManyToManyField(
+        MessageAttachment,
+        blank=True,
+    )
 
     objects = models.Manager()
     unread_messages = UnreadMessageManager()
@@ -321,4 +324,4 @@ class Message(models.Model):
         return email.message_from_string(self.body)
 
     def __unicode__(self):
-        return self.subject
+        return self.subject

setup.py

@@ -4,7 +4,7 @@ tests_require=['django']
 
 setup(
     name='django-mailbox',
-    version='1.6.1',
+    version='1.6.2',
     url='http://bitbucket.org/latestrevision/django-mailbox/',
     description='Import mail from POP3, IMAP, local mailboxes or directly from Postfix or Exim4 into your Django application automatically.',
     author='Adam Coddington',