Fix opening links on Android 12+

[Stypox]

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

#9726 wasn't enough. Android 12+ seems to return null to calls to resolveActivity, so the previous code would have said "No app can open this". Now instead, we try to open the activity in any case, even when we don't have a resolved package to set. I will take care of removing the now unused string if this PR is considered correct.
@AudricV do you think this is ok?

Fixes the following issue(s)

• See Release v0.25.0 (please TEST!) #9712 (comment)

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.

[TobiGr]

Is null returned on any Android version or just A12+? If the latter is the case, I'd suggest to implement the old behaviour for Android <= 11

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

0.0% Coverage
0.0% Duplication

[Stypox]

I thought about that, too. But what's the advantage of showing an error to the user instead of trying again in a different way?