### Godot version

v4.0.beta.custom_build [d1e5903c6]

### System information

Arch Linux kernel 6.1.7-arch1-1 x86_64 OpenSSH 9.1p1-3

### Issue description

When using SSH remote deploy, if the extra args field is empty (the default) the ssh command is not executed with success because a single space is inserted in place of the extra args.

```
Creating temporary directory...
Executing: ssh -p 22  davi@192.168.1.50 mktemp -d
Exit code: 255, Output: ssh: Could not resolve hostname : Name or service not known

ssh: Could not resolve hostname : Name or service not known
```

If any valid argument is passed, the command is executed successfully, in the example below I duplicated the `-p 22`, which is ignored, to show that it is not a problem of the hostname passed.

```
Executing: ssh -p 22 -p 22 davi@192.168.1.50 mktemp -d
Exit code: 0, Output: /tmp/tmp.DwFObXBL2s
```

This is infuriating for when you have non-interactive authentication configured in ssh-agent and just the hostname is needed for the connection.
This occurs for both SSH and SCP.

### Steps to reproduce

1. Enable a project to deploy with ssh
2. Fill only the hostname
3. Try to deploy
4. See the error on the console

### Minimal reproduction project

N/A
bool export_as_zip = p_path.ends_with("zip");
	String pkg_name;
	if (String(GLOBAL_GET("application/config/name")) != "") {
		pkg_name = String(GLOBAL_GET("application/config/name"));
	} else {
		pkg_name = "Unnamed";
	}
	pkg_name = OS::get_singleton()->get_safe_dir_name(pkg_name);
	
	String path = p_path;
	String tmp_dir_path = EditorPaths::get_singleton()->get_cache_dir().path_join(pkg_name);
	Ref<DirAccess> tmp_app_dir = DirAccess::create_for_path(tmp_dir_path);
	if (export_as_zip) {
		if (tmp_app_dir.is_null()) {
			return ERR_CANT_CREATE;
		}
		if (DirAccess::exists(tmp_dir_path)) {
			if (tmp_app_dir->change_dir(tmp_dir_path) == OK) {
				tmp_app_dir->erase_contents_recursive();
			}
		}
		tmp_app_dir->make_dir_recursive(tmp_dir_path);
		path = tmp_dir_path.path_join(p_path.get_file().get_basename());
	}
	
	Error err = EditorExportPlatformPC::export_project(p_preset, p_debug, path, p_flags);
	if (err != OK) {
		return err;
	}