fix: check if remoteEntry files is empty (#2761)

Co-authored-by: Zack Jackson <[email protected]>

Author: kbrooks

packages/manifest/src/StatsManager.ts

@@ -89,6 +89,7 @@ class StatsManager {
       const files = Array.from(remoteEntryNameChunk.files).filter(
         (f) => !f.includes(HOT_UPDATE_SUFFIX) && !f.endsWith('.css'),
       );
+      assert(files.length > 0, 'no files found for remoteEntry chunk');
       assert(
         files.length === 1,
         `remoteEntry chunk should not have multiple files!, current files: ${files.join(