[#23052] yugabyted: Restarting a node fails when data_dir is missing …

…in user specified configuration.

Summary:
When restarting yugabyted with a user configuration file that does not contain the `data_dir` parameter, an AttributeError is raised because the code attempts to call split on a `NoneType` object.
To fix the issue we simply check if the parameter is present in the given user configuration file, if it is not present then we do not split the parameter.
Jira: DB-11983

Test Plan: Manual Testing.

Reviewers: sgarg-yb, nikhil

Reviewed By: sgarg-yb, nikhil

Subscribers: shikhar.sahay

Differential Revision: https://phorge.dev.yugabyte.com/D36241

bin/yugabyted

@@ -5145,7 +5145,7 @@ class ControlScript(object):
             user_configs = Configs.parse_user_config_file(args.config)
             # User should not be able to override data_dir
             if (self.configs.saved_data.get("cluster_member")
-                                    and args.data_dir is None):
+                and args.data_dir is None and user_configs.get("data_dir")):
                 user_configs_data_dir = [
                     path for path in user_configs.get("data_dir").split(',')
                 ]