Add check to make sure archive has been created already

Co-authored-by: Josh Gross <joshmgross@github.com>

packages/cache/src/cache.ts

@@ -296,7 +296,9 @@ async function restoreCachev2(
     throw new Error(`Failed to restore: ${error.message}`)
   } finally {
     try {
+      if (archivePath) {
         await utils.unlinkFile(archivePath)
+      }
     } catch (error) {
       core.debug(`Failed to delete archive: ${error}`)
     }