withBreak blocks

[Oriol _]

This is so close to your proposal, and already works right now:

```js
block: {
  if (response.error) {
    log(response.message);
    break block;
  }
  if (!response.data) {
    log("No data");
    break block;
  }
  if (!response.data.todos) {
    log("No Todos");
    break block;
  }
  return action({ data: response.data });
}
```

- Oriol
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