@NotNull
  public static Couple<String> getBeforeAfterSha1(@NotNull Change change) throws VcsException {
    ContentRevision beforeRevision = change.getBeforeRevision();
    ContentRevision afterRevision = change.getAfterRevision();

    String before = beforeRevision == null ? NOT_COMMITTED_HASH : getSha1(getContentBytes(beforeRevision));
    String after = afterRevision == null ? NOT_COMMITTED_HASH : getSha1(getContentBytes(afterRevision));
    return new Couple<>(before, after);
  }
@NotNull
  public static Couple<String> getBeforeAfterSha1(@NotNull Change change)