I have a similiar problem with the same warning

** Warning ** ProcessScheduleInput: Schedule:Constant="ALWAYS OFF DISCRETE", Blank Schedule Type Limits Name input -- will not be validated.
   ** Warning ** ProcessScheduleInput: Schedule:Constant="ALWAYS ON CONTINUOUS", Blank Schedule Type Limits Name input -- will not be validated.

The thing is that I haven't created these schedules in OpenStudio and if I open the openstudio model in text editor they aren't there.