### 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
// Create our folder structure.
	= OK) {
		bose("Creating " + tmp_app_path_name + "/Contents/MacOS");
		err = tmp_app_dir->make_dir_recursive(tmp_app_path_name + "/Contents/MacOS");
		if (err != OK) {
			add_message(EXPORT_MESSAGE_ERROR, TTR("Export"), vformat(TTR("Could not create directory \"%s\"."), tmp_app_path_name + "/Contents/MacOS"));
		}
	}
	= OK) {
		bose("Creating " + tmp_app_path_name + "/Contents/Frameworks");
		err = tmp_app_dir->make_dir_recursive(tmp_app_path_name + "/Contents/Frameworks");
		if (err != OK) {
			add_message(EXPORT_MESSAGE_ERROR, TTR("Export"), vformat(TTR("Could not create directory \"%s\"."), tmp_app_path_name + "/Contents/Frameworks"));
		}
	}
	if ((err == OK) && helpers.size() > 0) {
		print_line("Creating " + tmp_app_path_name + "/Contents/Helpers");
		err = tmp_app_dir->make_dir_recursive(tmp_app_path_name + "/Contents/Helpers");
		if (err != OK) {
			add_message(EXPORT_MESSAGE_ERROR, TTR("Export"), vformat(TTR("Could not create directory \"%s\"."), tmp_app_path_name + "/Contents/Helpers"));
		}
	}
	= OK) {
		bose("Creating " + tmp_app_path_name + "/Contents/Resources");
		err = tmp_app_dir->make_dir_recursive(tmp_app_path_name + "/Contents/Resources");
		if (err != OK) {
			add_message(EXPORT_MESSAGE_ERROR, TTR("Export"), vformat(TTR("Could not create directory \"%s\"."), tmp_app_path_name + "/Contents/Resources"));
		}
	}
	Dictionary appnames = GLOBAL_GET("application/config/name_localized");