fix[MinecraftDownloader]: Better handling in local profile while online

[alexytomi]

This used to throw the exception below after swapping to MainActivity as the launcher prepares to launch java and thus the game

Amethyst-Android/app_pojavlauncher/src/main/java/net/kdt/pojavlaunch/Tools.java

Lines 898 to 899 in dcdcdff

	}catch(IOException e) {
	throw new RuntimeException("Can't find the source version for "+ versionName +" (req version="+customVer.inheritsFrom+")");

This resulted in a confusing error box. The PR just triggers that but earlier so we catch it and provide a nicer error box.

[crystall1nedev]

This PR does not build, see Actions for more info.

[alexytomi]

This PR does not build, see Actions for more info.

I forced push a fix but for some reason that didn't retrigger the thing. The issue was a missing import.

[alexytomi]

See here
https://github.com/alexytomi/PojavLauncher/actions/runs/15794736462

https://github.com/alexytomi/PojavLauncher/actions/runs/15794496928