Merge pull request ClickHouse#79409 from ClickHouse/ci_create_release_fix_2

CI: CreateRelease workflow: fix github helper with cache

Author: maxknv

tests/ci/github_helper.py

@@ -173,8 +173,9 @@ def get_pull_cached(
                     raise
                 self.sleep_on_rate_limit()
         logger.debug("Caching PR #%s from API in %s", number, cache_file)
-        with open(cache_file, "wb") as prfd:
-            self.dump(pr, prfd)  # type: ignore
+        if self.cache_path.is_dir():
+            with open(cache_file, "wb") as prfd:
+                self.dump(pr, prfd)  # type: ignore
         return pr
 
     def get_user_cached(