Last empty statements of case clauses are tree-shaken, but the lines are not removed.

[stephanedr]

• Rollup Version: 1.24.0
• Operating System (or Browser): Linux
• Node Version: 10.16.3

How Do We Reproduce?

switch (a) {
    case 0:
        console.log();
        break;
    case 1:
        ;
    default:
        ;
}

Expected Behavior

switch (a) {
    case 0:
        console.log();
        break;
    case 1:
    default:
}

Actual Behavior

switch (a) {
    case 0:
        console.log();
        break;
    case 1:

    default:

}

[lukastaegert]

This has been a long-standing issue, but with some recent improvements in our rendering helpers, it was actually not too difficult to fix in #3166.