Empty blocks should have new lines between curly brackets

[dangmai]

Right now, an empty block is formatted like this:

class EmptyClass {}

I think we should change it to this instead:

class EmptyClass {
}

The advantages are two fold:

• If the user later adds some body to this block, the VCS diff is only confined in that block.
• Dangling comments can be handled more easily.

There are a few places that would need modifications. Most significantly BlockStatement.

[dangmai]

From now on, empty blocks will have empty lines in them.