Fix: Handle Users with None Email in Admin Interface

app/eventyay/control/forms/users.py

@@ -62,15 +62,25 @@ class Meta:
 
     def __init__(self, *args, **kwargs):
         super().__init__(*args, **kwargs)
-        self.fields['email'].required = True
+        # Handle None email values - show empty field instead of "None" text
+        if self.instance and self.instance.pk and self.instance.email is None:
+            self.initial['email'] = ''
+            # Make email not required for existing users without email
+            self.fields['email'].required = False
+        else:
+            self.fields['email'].required = True
         self.fields['last_login'].disabled = True
         if self.instance and self.instance.auth_backend != 'native':
             del self.fields['new_pw']
             del self.fields['new_pw_repeat']
             self.fields['email'].disabled = True
 
     def clean_email(self):
-        email = self.cleaned_data['email']
+        email = self.cleaned_data.get('email', '').strip()
+        # Convert empty string to None for users without email
+        if not email:
+            return None
+        # Check for duplicate emails only if email is provided
         if User.objects.filter(Q(email__iexact=email) & ~Q(pk=self.instance.pk)).exists():
             raise forms.ValidationError(
                 self.error_messages['duplicate_identifier'],

app/eventyay/control/templates/pretixcontrol/admin/users/form.html

@@ -3,7 +3,7 @@
 {% load bootstrap3 %}
 {% block title %}{% trans "User" %}{% endblock %}
 {% block content %}
-    <h1>{% trans "User" %} {{ user.email }}</h1>
+    <h1>{% trans "User" %} {{ user.email|default:"—" }}</h1>
     <p>
         {% if user.auth_backend == "native" %}
             <form action='{% url "eventyay_admin:admin.users.reset" id=user.pk %}' method="post" class="form-inline helper-display-inline">

app/eventyay/control/templates/pretixcontrol/admin/users/index.html

@@ -52,9 +52,9 @@ <h1>{% trans "Users" %}</h1>
         {% for u in users %}
             <tr>
                 <td><strong>
-                    <a href='{% url "eventyay_admin:admin.users.edit" id=u.pk %}'>{{ u.email }}</a>
+                    <a href='{% url "eventyay_admin:admin.users.edit" id=u.pk %}'>{{ u.email|default:"—" }}</a>
                 </strong></td>
-                <td>{{ u.fullname|default_if_none:"" }}</td>
+                <td>{{ u.fullname|default:"—" }}</td>
                 <td>{% if u.is_active %}<span class="fa fa-check-circle"></span>{% endif %}</td>
                 <td>{% if u.is_staff %}<span class="fa fa-check-circle"></span>{% endif %}</td>
                 <td class="text-right flip">