public @NotNull YAMLSequence createEmptySequence() {
    YAMLSequence sequence = PsiTreeUtil.findChildOfType(createDummyYamlWithText("- dummy"), YAMLSequence.class);
    assert sequence != null;
    sequence.deleteChildRange(sequence.getFirstChild(), sequence.getLastChild());
    return sequence;
  }
public @NotNull YAMLSequence createEmptySequence()