Change missing cache directory error to warning (#1182)

* update error to warning when no dependency to cache

* updated the return

src/cache-save.ts

@@ -38,11 +38,12 @@ async function saveCache(packageManager: string) {
   core.debug(`paths for caching are ${cachePaths.join(', ')}`);
 
   if (!isCacheDirectoryExists(cachePaths)) {
-    throw new Error(
+    core.warning(
       `Cache folder path is retrieved for ${packageManager} but doesn't exist on disk: ${cachePaths.join(
         ', '
       )}. This likely indicates that there are no dependencies to cache. Consider removing the cache step if it is not needed.`
     );
+    return;
   }
 
   const primaryKey = core.getState(State.STATE_CACHE_PRIMARY_KEY);