Separate |nil| at the end of methods by a newline

This makes the generated code a bit more readable.
Revert "Separate headers (e.g. in |if|) longer than 3 lines by a newline"

I decided I don't like the blank line. (I wouldn't write it there
myself.)

This reverts commit 6f3aae4fdef74c10a434fe352f8bc8b8265b284a.