change: improve cli output for wails update

closes #1528

v2/cmd/wails/internal/commands/dev/dev.go

@@ -37,16 +37,25 @@ import (
 )
 
 func LogGreen(message string, args ...interface{}) {
+	if len(message) == 0 {
+		return
+	}
 	text := fmt.Sprintf(message, args...)
 	println(colour.Green(text))
 }
 
 func LogRed(message string, args ...interface{}) {
+	if len(message) == 0 {
+		return
+	}
 	text := fmt.Sprintf(message, args...)
 	println(colour.Red(text))
 }
 
 func LogDarkYellow(message string, args ...interface{}) {
+	if len(message) == 0 {
+		return
+	}
 	text := fmt.Sprintf(message, args...)
 	println(colour.DarkYellow(text))
 }

v2/cmd/wails/internal/commands/update/update.go

@@ -55,6 +55,12 @@ func AddSubcommand(app *clir.Cli, w io.Writer, currentVersion string) error {
 				desiredVersion, err = github.GetLatestPreRelease()
 			} else {
 				desiredVersion, err = github.GetLatestStableRelease()
+				if err != nil {
+					println("")
+					println("No stable release found for this major version. To update to the latest pre-release (eg beta), run:")
+					println("   wails update -pre")
+					return nil
+				}
 			}
 		}
 		if err != nil {

v2/cmd/wails/main.go

@@ -23,7 +23,7 @@ func fatal(message string) {
 }
 
 func banner(_ *clir.Cli) string {
-	return fmt.Sprintf("%s %s\n",
+	return fmt.Sprintf("%s %s",
 		colour.Yellow("Wails CLI"),
 		colour.DarkRed(internal.Version))
 }