Check if duration between stop_date and start_date is positiv.

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@17266 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5/Document/PresencePeriod.py

@@ -144,6 +144,7 @@ class PresencePeriod(Movement, PeriodicityMixin):
       periodicity_stop_date = self.getPeriodicityStopDate(
                                           start_date)
       second_duration = int(stop_date) - int(start_date)
+      if second_duration > 0:
         # First date has to respect the periodicity config
         next_start_date = self.getNextPeriodicalDate(start_date-1)
         while (next_start_date is not None) and \
@@ -162,7 +163,7 @@ class PresencePeriod(Movement, PeriodicityMixin):
           elif (current_exception_date is not None) and \
              (current_exception_date < next_start_date.Date()):
             # SQL method don't like iterator
-#             yield (next_start_date, next_start_date+duration)
+  #             yield (next_start_date, next_start_date+duration)
             result.append([next_start_date, 
                addToDate(next_start_date, second=second_duration)])
             # Update the next exception date
@@ -172,7 +173,7 @@ class PresencePeriod(Movement, PeriodicityMixin):
               current_exception_date = None
           else:
             # SQL method don't like iterator
-#             yield (next_start_date, next_start_date+duration)
+  #             yield (next_start_date, next_start_date+duration)
             result.append([next_start_date, 
                addToDate(next_start_date, second=second_duration)])
           next_start_date = self.getNextPeriodicalDate(next_start_date)