Fix ci_url might be None (#17332)

* fix

* Update utils/notification_service.py
Co-authored-by: Lysandre Debut <lysandre.debut@reseau.eseo.fr>
Co-authored-by: ydshieh <ydshieh@users.noreply.github.com>
Co-authored-by: Lysandre Debut <lysandre.debut@reseau.eseo.fr>

utils/notification_service.py

@@ -741,15 +741,16 @@ if __name__ == "__main__":
     ci_title = os.environ.get("CI_TITLE")
     ci_url = os.environ.get("CI_COMMIT_URL")
 
-    commit_number = ci_url.split("/")[-1]
-    ci_detail_url = f"https://api.github.com/repos/huggingface/transformers/commits/{commit_number}"
-    ci_details = requests.get(ci_detail_url).json()
-    ci_author = ci_details["author"]["login"]
-
     if ci_title is not None:
         assert ci_url is not None
         ci_title = ci_title.strip().split("\n")[0].strip()
 
+        # Retrieve the PR title and author login to complete the report
+        commit_number = ci_url.split("/")[-1]
+        ci_detail_url = f"https://api.github.com/repos/huggingface/transformers/commits/{commit_number}"
+        ci_details = requests.get(ci_detail_url).json()
+        ci_author = ci_details["author"]["login"]
+
         merged_by = None
         # Find the PR number (if any) and change the url to the actual PR page.
         numbers = pr_number_re.findall(ci_title)