feat: Only make security advisory dir if successful

Avoids empty directories for private repos

Author: lukasbestle

github_backup/github_backup.py

@@ -2039,7 +2039,6 @@ def backup_security_advisories(args, repo_cwd, repository, repos_template):
         return
 
     logger.info("Retrieving {0} security advisories".format(repository["full_name"]))
-    mkdir_p(repo_cwd, advisory_cwd)
 
     template = "{0}/{1}/security-advisories".format(
         repos_template, repository["full_name"]
@@ -2053,6 +2052,8 @@ def backup_security_advisories(args, repo_cwd, repository, repos_template):
             return
         raise
 
+    mkdir_p(repo_cwd, advisory_cwd)
+
     advisories = {}
     for advisory in _advisories:
         advisories[advisory["ghsa_id"]] = advisory