Bug in prerequisite tree parsing

[jloh02]

This prerequisite text leads to incorrect parsing.

If undertaking an Undergraduate DegreeTHEN( must have completed EE2012/ST2334 at a grade of at least D)AND( must have completed CG2023/EE2023 at a grade of at least D)

Source: https://api.nusmods.com/v2/2025-2026/modules/EE5140.json

Compared to https://api.nusmods.com/v2/2025-2026/modules/EE4205.json

We should implicitly add (effectively) brackets around the OR conditions for "/" - ((COURSES (1) EE2012:D, ST2334:D) vs (COURSES EE2012:D, ST2334:D)

[jloh02]

another issue brought here

[zehata]

nusmods/scrapers/nus-v2/src/services/requisite-tree/parseString.ts

Lines 131 to 135 in f722758

	// According to NUS documentation, if there is no course count, then ALL the
	// courses are required.
	if (courseCount === undefined) {
	return generateAndBranch(courses);
	}

Turns out this is actually an intended feature? We should probably clarify with the faculty if they really intended to omit the course number.

[zehata]

There are a bunch of duplicate issues we should be able to close