public @NotNull YAMLSequenceItem createEmptySequenceItem() {
    YAMLSequenceItem sequenceItem = PsiTreeUtil.findChildOfType(createDummyYamlWithText("- dummy"), YAMLSequenceItem.class);
    assert sequenceItem != null;
    YAMLValue value = sequenceItem.getValue();
    assert value != null;
    value.deleteChildRange(value.getFirstChild(), value.getLastChild());
    return sequenceItem;
  }
public @NotNull YAMLSequenceItem createEmptySequenceItem()