gcs: ignore zero length directory markers

backend/googlecloudstorage/googlecloudstorage.go

@@ -437,6 +437,17 @@ func (f *Fs) list(dir string, recurse bool, fn listFn) error {
 				continue
 			}
 			remote := object.Name[rootLength:]
+			// is this a directory marker?
+			if strings.HasSuffix(remote, "/") && object.Size == 0 {
+				if recurse {
+					// add a directory in if --fast-list since will have no prefixes
+					err = fn(remote[:len(remote)-1], object, true)
+					if err != nil {
+						return err
+					}
+				}
+				continue // skip directory marker
+			}
 			err = fn(remote, object, false)
 			if err != nil {
 				return err