### 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
String err = "";
	bool valid = true;
	String icon_path = ProjectSettings::get_singleton()->globalize_path(p_preset->get("application/icon"));
	if (!icon_path.is_empty() && !FileAccess::exists(icon_path)) {
		err += TTR("Invalid icon path:") + " " + icon_path + "\n";
	}
	
	String file_version = p_preset->get("application/file_version");
	if (!file_version.is_empty()) {
		PackedStringArray version_array = file_version.split(".", false);
		if (version_array.size() != 4 || !version_array[0].is_valid_int() ||
				!version_array[1].is_valid_int() || !version_array[2].is_valid_int() ||
				!version_array[3].is_valid_int() || file_version.find("-") > -1) {
			err += TTR("Invalid file version:") + " " + file_version + "\n";
		}
	}
	String product_version = p_preset->get("application/product_version");
	if (!product_version.is_empty()) {
		PackedStringArray version_array = product_version.split(".", false);
		if (version_array.size() != 4 || !version_array[0].is_valid_int() ||
				!version_array[1].is_valid_int() || !version_array[2].is_valid_int() ||
				!version_array[3].is_valid_int() || product_version.find("-") > -1) {
			err += TTR("Invalid product version:") + " " + product_version + "\n";
		}
	}
	if (!err.is_empty()) {
		r_error = err;
	}