diff --git a/piwik/indico_piwik/piwik.py b/piwik/indico_piwik/piwik.py
index ebf692c..f1fafcc 100644
--- a/piwik/indico_piwik/piwik.py
+++ b/piwik/indico_piwik/piwik.py
@@ -29,7 +29,7 @@ class PiwikRequest:
     @property
     def api_url(self):
         url = urlparse(self.server_url)
-        scheme = url.scheme if url.scheme else 'https'
+        scheme = url.scheme or 'https'
         return f'{scheme}://{url.netloc}{url.path}{self.query_script}'
 
     def call(self, default_response=None, **query_params):
diff --git a/piwik/indico_piwik/queries/metrics.py b/piwik/indico_piwik/queries/metrics.py
index d49f485..489f7a3 100644
--- a/piwik/indico_piwik/queries/metrics.py
+++ b/piwik/indico_piwik/queries/metrics.py
@@ -26,7 +26,7 @@ class PiwikQueryReportEventMetricVisitsBase(PiwikQueryReportEventMetricBase):
         result = get_json_from_remote_server(self.call)
         if reduced:
             return int(reduce_json(result)) if result else 0
-        return result if result else {}
+        return result or {}
 
 
 class PiwikQueryReportEventMetricReferrers(PiwikQueryReportEventMetricBase):