URL generation: Fix bug if plugins declare both event_urls and organizer_urls (#5688)

* URL generation: Fix bug if plugins declare both event_urls and organizer_urls

* Add missing file

* Add license header

src/tests/testdummy/urls.py

@@ -0,0 +1,52 @@
+#
+# This file is part of pretix (Community Edition).
+#
+# Copyright (C) 2014-2020  Raphael Michel and contributors
+# Copyright (C) 2020-today pretix GmbH and contributors
+#
+# This program is free software: you can redistribute it and/or modify it under the terms of the GNU Affero General
+# Public License as published by the Free Software Foundation in version 3 of the License.
+#
+# ADDITIONAL TERMS APPLY: Pursuant to Section 7 of the GNU Affero General Public License, additional terms are
+# applicable granting you additional permissions and placing additional restrictions on your usage of this software.
+# Please refer to the pretix LICENSE file to obtain the full terms applicable to this work. If you did not receive
+# this file, see <https://pretix.eu/about/en/license>.
+#
+# This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied
+# warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Affero General Public License for more
+# details.
+#
+# You should have received a copy of the GNU Affero General Public License along with this program.  If not, see
+# <https://www.gnu.org/licenses/>.
+#
+from django.http import HttpResponse
+from django.urls import path
+
+
+def view(request):
+    return HttpResponse("")
+
+
+urlpatterns = [
+    path(
+        "testdummy",
+        view,
+        name="view",
+    ),
+]
+
+organizer_patterns = [
+    path(
+        "testdummy",
+        view,
+        name="view",
+    ),
+]
+
+event_patterns = [
+    path(
+        "testdummy",
+        view,
+        name="view",
+    ),
+]