fix: allow initial reservation for seated events

[pranavv00]

Summary

Fixes #29448 where seated event slot reservations could incorrectly fail for the very first booking attempt.

Changes

• Remove the fallback branch that set shouldReserveSlot = false when no existing booking was found
• Check bookingAttendeesLength !== undefined instead of relying on truthiness

Result

Slot reservations now remain allowed when no booking exists yet, while still correctly preventing reservations once the seat limit is reached.

[github-actions]

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[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 4e3941ba-d80b-4d0a-8e8a-b31ab854d1f8

📥 Commits

Reviewing files that changed from the base of the PR and between 180ede2 and 0696e46.

📒 Files selected for processing (1)

• apps/api/v2/src/modules/slots/slots-2024-04-15/services/slots.service.ts

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📝 Walkthrough

Walkthrough

This PR refines the slot reservation logic in SlotsService_2024_04_15. The reserveSlot method changes how it determines whether to compute seat availability by moving from a truthy check on bookingAttendeesLength to an explicit definition check. This affects reservation behavior when attendee count is zero or when booking context is undefined. The constructor formatting is also corrected.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely summarizes the main change: fixing a bug that prevented initial reservations for seated events.
Description check	✅ Passed	The description is directly related to the changeset, explaining the problem, the changes made, and the expected result.
Linked Issues check	✅ Passed	The PR addresses issue #29448 by fixing the logic that incorrectly blocked first reservations for seated events when bookingUid is absent.
Out of Scope Changes check	✅ Passed	All changes are scoped to fixing the reservation logic for seated events; no unrelated modifications are present.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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