Should the formatter also add missing braces

To correct any violation of https://google.github.io/styleguide/javaguide.html#s4.1.1-braces-always-used

Currently it looks like a code that is formatted like

``` java
if (condition)
do_something
```

would be formatted (after running the tool) as:

``` java
if (condition) do_someting
```

where as I would expect it to be formatted as:

``` java
if (condition) {
do_something
}
```

該 issue 只提供了一個 Java 輸入/輸出範例，沒有指定原始檔、測試或進入點。先使用 google-java-format 重現該範例，然後定位處理單一陳述式控制主體的 formatter 路徑；當輸出使用大括號並如所示保留主體時，即表示完成。

由索引模型根據 Issue 內容生成。