fixed NPE on TV schedule notify conflict
Change made in method: TvBusinessLayer.GetConflictingSchedules()
. (near line 2537) added null protection around "overlapping" which caused a null schedule to be returned and inserted into a list of conflicting recording schedules (having a list contain a null value was causing an NPE during attempt to put up a dialog to notify user of conflict). The root cause problem is that the channel(s) are not mapped to a card but that condition is not detected so this null protection check avoids the unhandled exception.