From 2557a8e4ecc0962bc60b4e0b4da61b95451f98f3 Mon Sep 17 00:00:00 2001
From: Tobias Kunze <r@rixx.de>
Date: Sat, 8 Sep 2018 20:57:43 +0200
Subject: [PATCH] Allow to show all vouchers with empty tags

---
 src/pretix/control/forms/filter.py                |  5 ++++-
 .../templates/pretixcontrol/vouchers/tags.html    | 15 +++++++++++----
 2 files changed, 15 insertions(+), 5 deletions(-)

diff --git a/src/pretix/control/forms/filter.py b/src/pretix/control/forms/filter.py
index 3c59ddc4ad..2684e7f96a 100644
--- a/src/pretix/control/forms/filter.py
+++ b/src/pretix/control/forms/filter.py
@@ -796,7 +796,10 @@ class VoucherFilterForm(FilterForm):
 
         if fdata.get('tag'):
             s = fdata.get('tag').strip()
-            qs = qs.filter(tag__icontains=s)
+            if s == '<>':
+                qs = qs.filter(Q(tag__isnull=True) | Q(tag=''))
+            else:
+                qs = qs.filter(tag__icontains=s)
 
         if fdata.get('qm'):
             s = fdata.get('qm')
diff --git a/src/pretix/control/templates/pretixcontrol/vouchers/tags.html b/src/pretix/control/templates/pretixcontrol/vouchers/tags.html
index 198769ae2d..34537d0f41 100644
--- a/src/pretix/control/templates/pretixcontrol/vouchers/tags.html
+++ b/src/pretix/control/templates/pretixcontrol/vouchers/tags.html
@@ -27,10 +27,17 @@
                 {% for t in tags %}
                     <tr>
                         <td>
-                            <strong><a
-                                    href="{% url "control:event.vouchers" organizer=request.event.organizer.slug event=request.event.slug %}?tag={{ t.tag|urlencode }}">
-                                {{ t.tag }}
-                            </a></strong> <small>({{ t.redeemed }} / {{ t.total }})</small>
+                            <strong>
+                            {% if t.tag %}
+                                <a href="{% url "control:event.vouchers" organizer=request.event.organizer.slug event=request.event.slug %}?tag={{ t.tag|urlencode }}">
+                                    {{ t.tag }}
+                                </a>
+                            {% else %}
+                                <a href="{% url "control:event.vouchers" organizer=request.event.organizer.slug event=request.event.slug %}?tag={{ '<>'|urlencode }}">
+                                    {% trans "Empty tag" %}
+                                </a>
+                            {% endif %}
+                            </strong> <small>({{ t.redeemed }} / {{ t.total }})</small>
                         </td>
                         <td>
                             <div class="progress">