Empty line formatting works differently in anonymous functions assigned to class variables or module level variables.

[basro]

Describe the bug

When anonymous functions are assigned to a module level field or a class field empty newlines are removed.
This doesn't happen if an anonymous function is assigned to a local variable inside of a function.
I was not able to find a setting specific for anonymous functions assigned to class fields so I assume this is a bug.

Input file

class Foo {
	var a = function() {
		1;

		2;
	}
}

var b = function() {
	1;

	2;
}

Broken output

class Foo {
	var a = function() {
		1;
		2;
	}
}

var b = function() {
	1;
	2;
}

Expected output
Empty lines should be preserved.