### 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
return Error::FAILED;
			}
			if (p_preset->get("notarization/apple_id_name") != "") {
				if (p_preset->get("notarization/apple_id_password") == "") {
					add_message(EXPORT_MESSAGE_ERROR, TTR("Notarization"), TTR("Apple ID password not specified."));
					return Error::FAILED;
				}
				args.push_back("--username");
				args.push_back(p_preset->get("notarization/apple_id_name"));
				args.push_back("--password");
				args.push_back(p_preset->get("notarization/apple_id_password"));
			} else {
				if (p_preset->get("notarization/api_key") == "") {
					add_message(EXPORT_MESSAGE_ERROR, TTR("Notarization"), TTR("App Store Connect API key ID not specified."));
					return Error::FAILED;
				}
				args.push_back("--apiIssuer");
				args.push_back(p_preset->get("notarization/api_uuid"));
				args.push_back("--apiKey");
				args.push_back(p_preset->get("notarization/api_key_id"));
			}
			args.push_back("--type");
			args.push_back("osx");
			if (p_preset->get("notarization/apple_team_id")) {
				args.push_back("--asc-provider");
				args.push_back(p_preset->get("notarization/apple_team_id"));
			}
			args.push_back("--file");
			args.push_back(p_path);
			String str;