dev: Raise a nice error when we can't find guards in refactor_headers.py

Author: jorisv

development/scripts/misc/refactor_headers.py

@@ -284,8 +284,12 @@ def update_content(
     with path.open() as path_desc:
         content = path_desc.read()
     old_guard = find_guard(content)
+    if old_guard is None:
+        raise RuntimeError(f"{path} doesn't contains valid guards")
     print(f"\tNew guard: {new_guard}")
     content = update_guard(content, old_guard, new_guard)
+    if content is None:
+        raise RuntimeError(f"{path} doesn't have three guards")
     content, includes = remove_includes(content, str(module_path))
     if not dry:
         with path.open("w") as path:
@@ -389,6 +393,7 @@ def update_module(module_path: Path, include_root_path: Path, dry: bool = False)
     if not dry:
         with module_path.open("w") as module_path_desc:
             module_path_desc.write(module_content)
+    print()
 
 
 def is_dir(dir: str) -> Path: