Fix server error when percent change = N/A
Commit 7840e pushed by Anže Pečar

16 tests 16 passed Duration
accounts/tests.py::TestSelectedInstance::test_invalid_selected_instance 1.8661s
accounts/tests.py::TestSelectedInstance::test_no_selected_instance 0.1346s
accounts/tests.py::TestSelectedInstance::test_selected_instance 0.1350s
accounts/tests.py::TestSelectedInstance::test_selected_instance_https_truncate 0.1337s
accounts/tests.py::TestSelectedInstance::test_selected_instance_http_truncate 0.1690s
accounts/tests.py::TestSelectedInstance::test_selected_instance_slash_truncate 0.1335s
accounts/tests.py::TestSelectedInstance::test_selected_instance_through_session 0.1690s
accounts/tests.py::TestSelectedInstance::test_unselected_instance 0.1726s
accounts/tests.py::TestSitemap::test_sitemap 0.2054s
accounts/tests.py::TestStaticPages::test_developers_on_mastodon 0.1072s
accounts/tests.py::TestStaticPages::test_faq 0.1100s
confs/tests.py::TestConferencePage::test_conferences_page 0.1122s
stats/tests.py::TestStats::test_all_daily_lang_stats 0.0008s
stats/tests.py::TestStats::test_posts_from_yesterday_are_updated 0.0722s
stats/tests.py::TestStats::test_store_daily_stats 0.0632s
stats/tests.py::TestStats::test_store_daily_stats_with_accounts 0.0645s