Flaky test: auto complete project imports (ghcide) (9.2)

This test fails non-deterministically with the error below. It seems to affect 9.2 more.
```
ghcide
  completion
    project
      auto complete project imports: FAIL
        Exception: Prelude.head: empty list
```

https://github.com/haskell/haskell-language-server/runs/4758655639?check_suite_focus=true
