tidy trailing slash everywhere & fix tests

core/TESTS/tests.py

@@ -457,7 +457,7 @@ class PageTests(TestCase):
 
     def test_page_dwgallfiles_empty_slash(self):
         # this gets an empty page as the database has not been loaded
-        response = self.client.get("/dwgfiles/")
+        response = self.client.get("/dwgfiles")
         self.assertEqual(response.status_code, HTTPStatus.OK)
         content = response.content.decode()
         for ph in [