Resolve "Show invitation code when existing person without email is invited, otherwise show that email was send"

Closes #651 (closed)

aleksis/core/forms.py

@@ -597,6 +597,7 @@ class AccountRegisterForm(SignupForm, ExtensibleForm):
 
             if person:
                 available_fields = [field.name for field in Person._meta.get_fields()]
+                self.fields["email2"].initial = person.email
                 for field in self.fields:
                     if field in available_fields and getattr(person, field):
                         self.fields[field].disabled = True