Rework how we tell if there is a profile class

oscar/apps/customer/forms.py

                    'user_permissions', 'groups')
 
 
-if hasattr(settings, 'AUTH_PROFILE_MODULE'):
-    Profile = get_profile_class()
+Profile = get_profile_class()
+if Profile:
 
     class UserAndProfileForm(forms.ModelForm):
         first_name = forms.CharField(

oscar/core/loading.py

     """
     Return the profile model class
     """
+    setting = getattr(settings, 'AUTH_PROFILE_MODULE', None)
+    if setting is None:
+        return None
     app_label, model_name = settings.AUTH_PROFILE_MODULE.split('.')
     profile_class = get_model(app_label, model_name)
     if not profile_class: