More empty lines should be removed in some cases

[baryluk]

int main(string[] args) {

    if (args.lentgh > 2) {
        import std.stdio;

        writefln(args[1]);
    }

}

--brace_style=otbs

dfmt v0.15.1-debug

If it is a start or end of a scope, and there are no other things (like comments), these empty lines should be removed, and produce:

int main(string[] args) {
    if (args.lentgh > 2) {
        import std.stdio;

        writefln(args[1]);
    }
}