code: public void assertNullOrEmpty(@Nullable Description description, @Nullable String actual) {
      if (!isNullOrEmpty(actual)) {
        throw failures.failure(description, shouldBeNullOrEmpty(actual));
      }
    }
docs: Asserts that the <em>actual</em> {@code String} is {@code null} or empty.
  
  @param description the description of the <em>actual</em> {@code String}.
  @param actual the <em>actual</em> {@code String}.
  @throws AssertionError if the <em>actual</em> {@code String} is not {@code null} and not empty.