fix user creation bug

cfp/forms.py

@@ -45,6 +45,7 @@ class CreateUserForm(forms.ModelForm):
         email = self.cleaned_data.get('email')
         if email and User.objects.filter(email=email).exists():
             raise forms.ValidationError(_('A user with that email already exists.'))
+        return email
 
     def save(self, commit=True):
         user = super().save(commit=False)