small fix to allow fallback in case of missing headers

portal/auth_backends.py

@@ -4,9 +4,9 @@ from django.contrib.auth.models import User
 
 class TokenAuthBackend(ModelBackend):
     def authenticate(self, request, token=None):
-        if not token:
+        if not token and 'headers' in request:
             token = request.headers.get('Iric-Auth-Token')
-        try:
-            return User.objects.get(profile__api_token=token)
-        except User.DoesNotExist:
-            return None
+            try:
+                return User.objects.get(profile__api_token=token)
+            except User.DoesNotExist:
+                return None