Fix crash when rotating device on unsupported channels

[GGAutomaton]

What is it?

• Bugfix (user facing)
• Feature (user facing)
• Codebase improvement (dev facing)
• Meta improvement to the project (dev facing)

Description of the changes in your PR

See #6696 (comment)

Fixes the following issue(s)

• Fixes Crash when rotating device on unsupported channels #6696

APK testing

The APK can be found by going to the "Checks" tab below the title. On the left pane, click on "CI", scroll down to "artifacts" and click "app" to download the zip file which contains the debug APK of this PR.

Due diligence

• I read the contribution guidelines.

[GGAutomaton]

Reproduction steps:

1. Open a channel which is not supported by NewPipe, e.g., https://www.youtube.com/channel/UClYV6hHlupm_S_ObS1W-DYw
2. Rotate the screen

Also test rotation on a normal channel, the behavior is the same as before.

[Stypox]

Btw, I don't think I am able to test properly. The crash on this channel is actually fixed, but showContentNotSupported should do something: making views visible and showing kaomojis. Could you look into why nothing of that happens? Btw, there is no need to do that in this PR.

[GGAutomaton]

_{Mod note: don't quote if you don't need to. Or quote only the necessary parts.}

I haven't found the reason yet. I'll try again when I'm free.

[litetex]

@Stypox

You have fallen victim to #6870 😉

[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

0.0% Coverage
0.0% Duplication

[Stypox]

I can confirm it works, then. Thank you! #6870 needs to be solved separately, but at least this crash is fixed.

_{Btw, you got PR number 8192=2^13, feel honoured by that ;-)}

[GGAutomaton]

I can confirm it works, then. Thank you! #6870 needs to be solved separately, but at least this crash is fixed.

Btw, you got PR number 8192=2^13, feel honoured by that ;-)

The software engineering course of our college requires to contribute to the open source community.
I have also learned a lot from this project. Thank you for your warm help :)

[Stypox]

Great :-D