refactor: Catch index errors when finding top module in case of searc…

…h path misconfiguration

Issue-#246: #246

src/griffe/finder.py

@@ -395,10 +395,9 @@ def _top_module_name(self, path: Path) -> str:
  # Always resolve parent path to compare for relativeness against resolved search paths.
  parent_path = parent_path.resolve()
  for search_path in self.search_paths:
- with suppress(ValueError):
+ with suppress(ValueError, IndexError):
  rel_path = parent_path.relative_to(search_path.resolve())
- top_path = search_path / rel_path.parts[0]
- return top_path.name
+ return rel_path.parts[0]
  # If not, get the highest directory with an `__init__` module,
  # add its parent to search paths and return it.
  while parent_path.parent != parent_path and (parent_path.parent / "__init__.py").exists():