fmt: write empty or blocks the same as empty fn bodies, empty structs, etc (#9136)

vlib/v/fmt/fmt.v

@@ -850,7 +850,11 @@ pub fn (mut f Fmt) or_expr(node ast.OrExpr) {
 		.absent {}
 		.block {
 			if node.stmts.len == 0 {
-				f.write(' or { }')
+				f.write(' or {')
+				if node.pos.line_nr != node.pos.last_line {
+					f.writeln('')
+				}
+				f.write('}')
 				return
 			} else if node.stmts.len == 1 && stmt_is_single_line(node.stmts[0]) {
 				// the control stmts (return/break/continue...) print a newline inside them,

vlib/v/fmt/tests/or_keep.vv

@@ -1,3 +1,9 @@
+fn main() {
+	empty_or_block() or {}
+	empty_or_block() or {
+	}
+}
+
 fn fn_with_or() int {
 	fn_with_optional() or { return 10 }
 	return 20