Several feeds crash GTFS transformer during calendar simplification

[demory]

Known feeds:
UTA (S3 ID = b65b2cdf-9a75-4392-9188-a7f771f96601)
Edmonton (S3 ID = fec569e7-83ee-4361-b92f-c5c3fedbe66b)
Madison (S3 ID = 4cdb0435-e3a5-49ce-ab4e-a4dace05944e)
Ride-On (S3 ID = 69c9bbb5-e6f9-4b04-becd-9f5cb6137298)
Delaware Transit (S3 ID = 166e5ab4-38eb-42e1-b905-2005a6f93458)
Norwalk Transit (S3 ID = 27c3116e-9a31-4697-9bae-f7ddc72be05c)
Placer County CA (S3 ID = 0f7b36a7-7830-41f8-90a4-aaa3f44cb132)

Typical output:

2012-10-23 18:56:31,301 INFO  [CalendarServiceDataFactoryImpl.java:90] : serviceId=Utah Transit Authority_12704 (31/33)
2012-10-23 18:56:31,309 INFO  [CalendarServiceDataFactoryImpl.java:90] : serviceId=Utah Transit Authority_84204 (32/33)
2012-10-23 18:56:31,320 INFO  [CalendarServiceDataFactoryImpl.java:90] : serviceId=Utah Transit Authority_123704 (33/33)
java.lang.IndexOutOfBoundsException: Index: 0, Size: 0
        at java.util.ArrayList.rangeCheck(ArrayList.java:571)
        at java.util.ArrayList.get(ArrayList.java:349)
        at org.onebusaway.gtfs_transformer.updates.CalendarSimplicationLibrary.computeSimplifiedCalendar(CalendarSimplicationLibrary.java:125)
        at org.onebusaway.gtfs_transformer.updates.CalendarSimplicationStrategy.run(CalendarSimplicationStrategy.java:113)
        at org.onebusaway.gtfs_transformer.GtfsTransformer.udateGtfs(GtfsTransformer.java:176)
        at org.onebusaway.gtfs_transformer.GtfsTransformer.run(GtfsTransformer.java:130)
        at org.onebusaway.gtfs_transformer.GtfsTransformerMain.runApplication(GtfsTransformerMain.java:197)
        at org.onebusaway.gtfs_transformer.GtfsTransformerMain.run(GtfsTransformerMain.java:92)
        at org.onebusaway.gtfs_transformer.GtfsTransformerMain.main(GtfsTransformerMain.java:71)