If there are no bits back, we get a nil array response, not a zero-length one.

AndreRenaud · AndreRenaud · commit 6f33d800f5f2 · 2023-06-14T15:12:34.000+12:00
This was causing `go test` to fail.
diff --git a/bitmap_test.go b/bitmap_test.go
@@ -19,7 +19,7 @@ func Test_bitsToArray(t *testing.T) {
 		{
 			name: "2",
 			bits: []byte{},
-			want: []int{},
+			want: nil,
 		},
 		{
 			name: "3",

Original file line number	Diff line number	Diff line change
`@@ -19,7 +19,7 @@ func Test_bitsToArray(t *testing.T) {`
`19`	`19`	`{`
`20`	`20`	`name: "2",`
`21`	`21`	`bits: []byte{},`
`22`		`- want: []int{},`
	`22`	`+ want: nil,`
`23`	`23`	`},`
`24`	`24`	`{`
`25`	`25`	`name: "3",`