Fix empty ListMultiple.

cmd/zenity/main.go

@@ -474,8 +474,10 @@ func lstResult(l []string, err error) {
 	if err != nil {
 		errResult(err)
 	}
-	os.Stdout.WriteString(strings.Join(l, zenutil.Separator))
-	os.Stdout.WriteString(zenutil.LineBreak)
+	if len(l) > 0 {
+		os.Stdout.WriteString(strings.Join(l, zenutil.Separator))
+		os.Stdout.WriteString(zenutil.LineBreak)
+	}
 	os.Exit(0)
 }
 

internal/zenutil/osa_generated.go

@@ -42,7 +42,7 @@ if(Array.isArray(res)){res.join({{json .Separator}})}else{res.toString()}
 var app=Application.currentApplication()
 app.includeStandardAdditions=true
 var res=app.chooseFromList({{json .Items}},{{json .Options}})
-res.join({{json .Separator}})
+if(res.length!==0)res.join({{json .Separator}})
 {{- end}}
 {{define "notify" -}}
 var app=Application.currentApplication()

internal/zenutil/osascripts/list.gojs

@@ -2,4 +2,4 @@ var app = Application.currentApplication()
 app.includeStandardAdditions = true
 
 var res = app.chooseFromList({{json .Items}}, {{json .Options}})
-res.join({{json .Separator}})
+if (res.length !== 0) res.join({{json .Separator}})

util_unix.go

@@ -71,8 +71,11 @@ func strResult(opts options, out []byte, err error) (string, error) {
 
 func lstResult(opts options, out []byte, err error) ([]string, error) {
 	str, err := strResult(opts, out, err)
-	if err == nil {
-		return strings.Split(str, zenutil.Separator), nil
+	if err != nil {
+		return nil, err
 	}
-	return nil, err
+	if len(out) == 0 {
+		return []string{}, nil
+	}
+	return strings.Split(str, zenutil.Separator), nil
 }

util_unix_test.go

@@ -98,6 +98,9 @@ func Test_lstResult(t *testing.T) {
 	sentinel := errors.New("sentinel")
 	cancel := exec.Command("false").Run()
 
+	if out, err := lstResult(options{}, []byte(""), nil); !reflect.DeepEqual(out, []string{}) || err != nil {
+		t.Errorf(`lstResult("out", nil) = %v, %v`, out, err)
+	}
 	if out, err := lstResult(options{}, []byte("out"), nil); !reflect.DeepEqual(out, []string{"out"}) || err != nil {
 		t.Errorf(`lstResult("out", nil) = %v, %v`, out, err)
 	}