optimize call of run_booking() + tests

planner.py

@@ -359,10 +359,12 @@ class ScheduledBooking(DeactivableMixin, ModelSQL, ModelView):
         super(ScheduledBooking, cls).write(*args)
         cls.update_next_occurence(records)
 
-    def run_booking(self):
+    @classmethod
+    def run_booking(cls, records):
         """ do prepared booking
         """
-        print('-- booking:', self.rec_name)
+        for record in records:
+            print('-- booking:', record.rec_name)
 
     @classmethod
     def cronjob(cls):
@@ -376,11 +378,10 @@ class ScheduledBooking(DeactivableMixin, ModelSQL, ModelView):
             ('active', '=', True),
             ('nextrun.date', '<=', query_date)])
 
-        for record in records:
-            record.run_booking()
-
-        cls.update_next_occurence(
-            records,
-            query_date=query_date + timedelta(days=1))
+        if records:
+            cls.run_booking(records)
+            cls.update_next_occurence(
+                records,
+                query_date=query_date + timedelta(days=1))
 
 # ens ScheduledBooking