fix: can't add gitlab personal access token and add more debug log in validate_provider_token (#8782)

openhands/integrations/gitlab/gitlab_service.py

@@ -167,10 +167,14 @@ class GitLabService(BaseGitService, GitService):
         url = f'{self.BASE_URL}/user'
         response, _ = await self._make_request(url)
 
+        # Use a default avatar URL if not provided
+        # In some self-hosted GitLab instances, the avatar_url field may be returned as None.
+        avatar_url = response.get('avatar_url') or ''
+
         return User(
             id=response.get('id'),
             username=response.get('username'),
-            avatar_url=response.get('avatar_url'),
+            avatar_url=avatar_url,
             name=response.get('name'),
             email=response.get('email'),
             company=response.get('organization'),