Some rows in the scraped page don't have a CRN etc. because they're just the second "day" of the course. Rather than a multi-day course having all days at the same time (i.e. MWR 10:00am to 11:40am), some courses have different times for different days, which are represented by additional rows.
Some rows in the scraped page don't have a CRN etc. because they're just the second "day" of the course. Rather than a multi-day course having all days at the same time (i.e. MWR 10:00am to 11:40am), some courses have different times for different days, which are represented by additional rows.