add a fake get_duration() method to nonstop slots

panikdb/emissions/utils.py

@@ -132,6 +132,10 @@ def period_program(date_start, date_end):
         def __repr__(self):
             return repr(self.label)
 
+        def get_duration(self):
+            # fake duration
+            return 0
+
 
     first_day_start = datetime(*date_start.replace(hour=6, minute=0).timetuple()[:5])
     last_day_end = datetime(*date_end.replace(hour=5, minute=0).timetuple()[:5])