Fix 2.00B schedule parsing

[cjquines]

http://student.mit.edu/catalog/search.cgi?search=2.00b

https://fireroad.mit.edu/courses/lookup/2.00b

[cjquines]

@psvenk do you know how often fireroad server scrapes catalog? or is it the case that the lecture schedule for 2.00b hasn't been updated yet because it can't parse the schedule as a whole, so it tosses everything out?