facebook/tornado — pull request #546 by yqz (2012-06-25 03:08:05+00:00)
Title: Fix empty statement block

The following code will throw exception, because the generated code didn't add "pass" for empty "if" statement. The same for other ControlBlocks.

```template = Template(utf8("{% if x > 4 %}{%elif x < 0%}{%else%}{%end%}"))```

I am not sure if this is the cleanest fix though, it should be the simplest one.