Bug 832

Summary:	Program crashes when using AE system with 0 doctor.
Product:	Hospital System	Reporter:	hongjlee2-c
Component:	AE System	Assignee:	klhwong3-c
Status:	CONFIRMED ---
Severity:	critical
Priority:	High
Version:	Alpha Release
Hardware:	PC
OS:	Windows
URL:	N/A

Description hongjlee2-c 2023-12-10 00:59:37 HKT

Step To Reproduce:
1. Login.
2. Make sure to have no AE doctor. (You will have no AE doctor by default) 
3. Input “2” to enter the AE system.
4. Input “1” to get a ticket and input any illness (e.g. “fever”)

Actual Results:
The program prints out crashes with an ArithmeticException exception.

Expected Results:
The program should not crash and give the ticket.

Suggested Fix:
We should have the list of doctors in AE.java. Add a condition to check whether this list is empty or not.