backoffice: display message on global statistics when there are no formdefs (#15644)

tests/test_backoffice_pages.py

@@ -1550,6 +1550,21 @@ def test_backoffice_multi_actions(pub):
             assert formdata.status != 'wf-accepted'
 
 
+def test_backoffice_statistics_with_no_formdefs(pub):
+    create_user(pub)
+    create_environment(pub)
+    FormDef.wipe()
+    if pub.is_using_postgresql():
+        from wcs.sql import get_connection_and_cursor, drop_global_views
+        conn, cur = get_connection_and_cursor()
+        drop_global_views(conn, cur)
+        conn.commit()
+        cur.close()
+
+    app = login(get_app(pub))
+    resp = app.get('/backoffice/management/statistics')
+    assert 'This site is currently empty.' in resp.body
+
 def test_backoffice_statistics_status_filter(pub):
     create_superuser(pub)
     create_environment(pub)

wcs/backoffice/management.py

@@ -686,6 +686,18 @@ class ManagementDirectory(Directory):
     def statistics(self):
         html_top('management', _('Global statistics'))
         get_response().breadcrumb.append(('statistics', _('Global statistics')))
+
+        if FormDef.count() == 0:
+            r = TemplateIO(html=True)
+            r += htmltext('<div class="top-title">')
+            r += htmltext('<h2>%s</h2>') % _('Global statistics')
+            r += htmltext('</div>')
+            r += htmltext('<div class="big-msg-info">')
+            r += htmltext('<p>%s</p>') % _(
+                'This site is currently empty.  It is required to first add forms.')
+            r += htmltext('</div>')
+            return r.getvalue()
+
         get_response().filter['sidebar'] = self.get_stats_sidebar()
         r = TemplateIO(html=True)
         r += htmltext('<h2>%s</h2>') % _('Global statistics')