Fix voucher validation in CartManager

src/pretix/base/services/cart.py

@@ -225,7 +225,10 @@ class CartManager:
 
     def _check_item_constraints(self, op):
         if isinstance(op, self.AddOperation) or isinstance(op, self.ExtendOperation):
-            if (op.item.require_voucher or op.item.hide_without_voucher) and (op.voucher is None or not op.voucher.show_hidden_items):
+            if op.item.require_voucher and op.voucher is None:
+                raise CartError(error_messages['voucher_required'])
+
+            if op.item.hide_without_voucher and (op.voucher is None or not op.voucher.show_hidden_items):
                 raise CartError(error_messages['voucher_required'])
 
             if not op.item.is_available() or (op.variation and not op.variation.active):

src/pretix/presale/templates/pretixpresale/event/order.html

@@ -56,7 +56,7 @@
         <div class="clearfix"></div>
     </h2>
     {% if order.status == "n" and not order.require_approval %}
-        <div class="panel panel-danger">
+        <div class="panel panel-primary">
             <div class="panel-heading">
                 <h3 class="panel-title">
                     {% trans "Payment" %}