CahcheUtils throws raw runtime exception

### Affected version

HEAD

### Bug description

This is almost certainly wrong. There should be a checked exception here

```
throw new RuntimeException("Bad zip entry");
}
```

Search the repository for the exact "Bad zip entry" message and read the surrounding zip-entry handling and existing exception conventions first. Done means the bad-entry path no longer exposes a raw runtime exception and the affected behavior is covered by the project's existing verification.

Written by the indexing model from the issue text.