"My Grades" errors when no grades are available

[ctsk]

Steps to Reproduce

0. Be enrolled at TUM but have no exams written yet
1. Connect to TUM Online
2. Open "My Grades"

Expected Result

Something like "No grades available"

Actual Result

"Unknown Error"

Problem

Probably relates to Tickaroo/tikxml#155

• TUMOnline returns an empty list
• tikxml parses this to a null
• value which makes the kotlin runtime complain as in

  Campus-Android/app/src/main/java/de/tum/in/tumcampusapp/component/tumui/grades/model/ExamList.kt

  Line 13 in 3772bf2

  data class ExamList(@Element val exams: List<Exam> = mutableListOf())

  exams may not be null

Suggested Enhancement ✨

Either:

• Fix TikXml (I've got no clue how to do that)

or:

• make ExamList.exams nullable
• Add null checks in these methods

  • Campus-Android/app/src/main/java/de/tum/in/tumcampusapp/component/tumui/grades/GradesFragment.kt

    Line 101 in 3772bf2

    override fun onDownloadSuccessful(response: ExamList) {

  • Campus-Android/app/src/main/java/de/tum/in/tumcampusapp/component/tumui/grades/GradesBackgroundUpdater.kt

    Line 28 in 3772bf2

    override fun onResponse(call: Call<ExamList>, response: Response<ExamList>) {

Environment

• Phone: Pixel
• OS version: 12
• TUM Campus App version: v3.13
• Language: English

[ctsk]

Fixed in #1431