Fix test for blocking site from results

Previously the logic for testing site blocking was essentially "assert
blocked_site not part of result_site". This caused test failures, since
site blocking does not extend to subdomains for the blocked site. The
reversed logic makes more sense with what the test was trying to
accomplish.

test/test_results.py

@@ -75,7 +75,7 @@ def test_block_results(client):
 
     assert has_pinterest
 
-    demo_config['block'] = 'pinterest.com,help.pinterest.com'
+    demo_config['block'] = 'pinterest.com'
     rv = client.post(f'/{Endpoint.config}', data=demo_config)
     assert rv._status_code == 302
 
@@ -83,7 +83,10 @@ def test_block_results(client):
     assert rv._status_code == 200
 
     for link in BeautifulSoup(rv.data, 'html.parser').find_all('a', href=True):
-        assert 'pinterest.com' not in urlparse(link['href']).netloc
+        result_site = urlparse(link['href']).netloc
+        if not result_site:
+            continue
+        assert result_site not in 'pinterest.com'
 
 
 def test_recent_results(client):