fix: ensure iteration over directories (#452)

* fix: ensure iteration over directories

* style: pre-commit fixes

* Update src/sp_repo_review/checks/general.py

---------

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

src/sp_repo_review/checks/general.py

@@ -84,7 +84,10 @@ def check(package: Traversable) -> bool:
         src = package.joinpath("src")
         if src.is_dir():
             for pkg in src.iterdir():
-                if len([p for p in pkg.iterdir() if "test" in p.name]) > 0:
+                if (
+                    pkg.is_dir()
+                    and len([p for p in pkg.iterdir() if "test" in p.name]) > 0
+                ):
                     return True
         return False