Catroid 1661 - Fixed empty parameterized test data

[moe-threeface]

This PR adds a reusable helper to fail parameterized tests explicitly when dynamically collected test data is empty.

Applied to:

• BricksHelpUrlTest, which discovers Brick classes via DexFile
• CatrobatTestRunner, which collects .catrobat test assets recursively

I checked the remaining @Parameterized.Parameters usages. They use explicit static test data and were intentionally left unchanged.

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud