Update CI

Author: y0z

optunahub-registry/header_confirm.py

@@ -5,12 +5,19 @@
 
 def header_confirm(path: str) -> None:
     post = frontmatter.load(path)
+
     assert "author" in post.keys(), f"author is not found in {path}"
     assert "title" in post.keys(), f"title is not found in {path}"
     assert "description" in post.keys(), f"description is not found in {path}"
     assert "tags" in post.keys(), f"tags is not found in {path}"
     assert "optuna_versions" in post.keys(), f"optuna_versions is not found in {path}"
     assert "license" in post.keys(), f"license is not found in {path}"
+    assert post["author"] != "", f"author is empty in {path}"
+    assert post["title"] != "", f"title is empty in {path}"
+    assert post["description"] != "", f"description is empty in {path}"
+    assert post["tags"] != "", f"tags is empty in {path}"
+    assert post["optuna_versions"] != "", f"optuna_versions is empty in {path}"
+    assert post["license"] != "", f"license is empty in {path}"
 
 
 if __name__ == "__main__":