Fix 'missing input file' checker

6 jobs for !16 with feat/linter in 5 minutes and 55 seconds (queued for 40 seconds)
latest merge request
Name Stage Failure
failed
gruppen: [4, iComputerfreak/DerCompiler, 0] Run

[SUCCESS] lexer:uppercase-keywords.mj correct
[SUCCESS] lexer:wild-whitespaces.mj correct
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Ran 24 tests, of which 6 failed.
A full report for each test can be found at ../../../mjtest/reports/31-10-21_00-53-18.failed
Running after_script
Uploading artifacts for failed job
ERROR: Job failed: exit code 1
failed
gruppen: [3, larsk21/compiler-minijava, 0] Run
[SUCCESS] lexer:unicode_whitespace.invalid.mj     correct
[SUCCESS] lexer:uppercase-keywords.mj correct
[SUCCESS] lexer:wild-whitespaces.mj correct
----------------------------------------
Ran 24 tests, of which 4 failed.
A full report for each test can be found at ../../../mjtest/reports/31-10-21_00-51-54.failed
Running after_script
Uploading artifacts for failed job
ERROR: Job failed: exit code 1
failed
gruppen: [2, compilerpraktikum/compiler, 0] Run

[SUCCESS] lexer:uppercase-keywords.mj correct
[SUCCESS] lexer:wild-whitespaces.mj correct
----------------------------------------
Ran 24 tests, of which 6 failed.
A full report for each test can be found at ../../../mjtest/reports/31-10-21_00-50-32.failed
Running after_script
Uploading artifacts for failed job
ERROR: Job failed: exit code 1