cli: help displayed when a Command has no execute function (fix #6530) (#6567)

vlib/cli/command.v

@@ -186,36 +186,32 @@ fn (mut cmd Command) parse_commands() {
 		}
 	}
 	// if no further command was found, execute current command
-	if int(cmd.execute) == 0 {
-		if !cmd.disable_help {
-			cmd.execute_help()
-		}
-	} else {
 	if cmd.required_args > 0 {
 		if cmd.required_args > cmd.args.len {
-				println('Command `$cmd.name` needs at least $cmd.required_args arguments')
+			eprintln('Command `$cmd.name` needs at least $cmd.required_args arguments')
 			exit(1)
 		}
 	}
 	cmd.check_required_flags()
 	if int(cmd.pre_execute) > 0 {
 		cmd.pre_execute(*cmd) or {
-				println('cli preexecution error: $err')
+			eprintln('cli preexecution error: $err')
 			exit(1)
 		}
 	}
+	if int(cmd.execute) > 0 {
 		cmd.execute(*cmd) or {
-			println('cli execution error: $err')
+			eprintln('cli execution error: $err')
 			exit(1)
 		}
+	}
 	if int(cmd.post_execute) > 0 {
 		cmd.post_execute(*cmd) or {
-				println('cli postexecution error: $err')
+			eprintln('cli postexecution error: $err')
 			exit(1)
 		}
 	}
 }
-}
 
 fn (cmd Command) check_help_flag() {
 	if !cmd.disable_help && cmd.flags.contains('help') {

vlib/v/tests/inout/cli_command_no_execute.vv

@@ -0,0 +1,7 @@
+import os
+import cli {Command}
+
+fn main() {
+	mut cmd := Command {}                                                       
+	cmd.parse(os.args)
+}