Method noneableCast

src/main/java/net/starlark/java/eval/Dict.java:687–690

Like #cast, but if x is None, returns an empty Dict.

(
      Object x, Class<K> keyType, Class<V> valueType, String what)

  /** Like {@link #cast}, but if x is None, returns an empty Dict. */
  public static <K, V> Dict<K, V> noneableCast(
      Object x, Class<K> keyType, Class<V> valueType, String what) throws EvalException {
    return x == Starlark.NONE ? empty() : cast(x, keyType, valueType, what);
  }

  @Override
  public Object getIndex(StarlarkSemantics semantics, Object key) throws EvalException {