private @NotNull Map<String, String> readPackedBranches() {
    if (!myPackedRefsFile.exists()) {
      return emptyMap();
    }
    try {
      String content = DvcsUtil.tryLoadFile(myPackedRefsFile, CharsetToolkit.UTF8);
      return ContainerUtil.map2MapNotNull(LineTokenizer.tokenize(content, false), GitRefUtil::parseBranchesLine);
    }
    catch (RepoStateException e) {
      return emptyMap();
    }
  }
private @NotNull Map<String, String> readPackedBranches()