Simpler and bug free loop for parsing erp response

[yashsirvi]

• The previous loop was too convoluted and not easy to follow.
• Had a bug of not adding the last lecture of a day because the statement of adding the previous course at the end of the day was unreachable.
  • Put that code outside the loop of the cells (hours) and instead at the end of each iteration of the row loop (days).

It works with my timetable: Empty work days and variable length classes, but please verify once with other timetables.