Fix some bugs for bundler

Author: KCarretto

cmd/bundle/dropper.go

@@ -14,7 +14,7 @@ func main() {
 	ctx := context.Background()
 
 	bundle := assetslib.TarGZBundler{
-		Buffer: bytes.NewBuffer(Assets),
+		Buffer: bytes.NewBuffer(assets), // See assets.gen.go
 	}
 
 	fs, err := bundle.FileSystem()

cmd/bundle/main.go

@@ -21,6 +21,10 @@ func main() {
 				return err
 			}
 
+			if info.IsDir() {
+				return nil
+			}
+
 			f, err := os.Open(path)
 			if err != nil {
 				return err