Require at least one of street, zipcode, city if invoice_address_required

src/pretix/base/forms/questions.py

@@ -1153,6 +1153,8 @@ class BaseInvoiceAddressForm(forms.ModelForm):
                 raise ValidationError({"company": _('You need to provide a company name.')})
             if not data.get('is_business') and not data.get('name_parts'):
                 raise ValidationError(_('You need to provide your name.'))
+            if not data.get('street') and not data.get('zipcode') and not data.get('city'):
+                raise ValidationError({"street": _('This field is required.')})
 
         if 'vat_id' in self.changed_data or not data.get('vat_id'):
             self.instance.vat_id_validated = False