Fix NaT representation for newer version of Pandas (pandas-dev/pandas#29578 - it was a feature, not a bug! :))

Author: RugeljGG

Website/results.py

@@ -16,7 +16,7 @@
 def _timezone(series):
     s = pd.to_datetime(series, unit='s')
     s = s.dt.tz_localize('UTC').dt.tz_convert('CET')
-    s = s.dt.strftime('%#d.%m. %H:%M:%S')
+    s = s.dt.strftime('%#d.%m. %H:%M:%S').fillna('NaT')
     return s