### 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
add_message(EXPORT_MESSAGE_ERROR, TTR("Code Signing"), TTR("Xrcodesign path is not set. Configure rcodesign path in the Editor Settings (Export > macOS > rcodesign)."));
				return Error::FAILED;
			}
			List<String> args;
			args.push_back("sign");
			if (p_path.get_extension() != "dmg") {
				args.push_back("--entitlements-xml-path");
				args.push_back(p_ent_path);
			}
			String certificate_file = p_preset->get("codesign/certificate_file");
			String certificate_pass = p_preset->get("codesign/certificate_password");
			if (!certificate_file.is_empty() && !certificate_file.is_empty()) {
				args.push_back("--p12-file");
				args.push_back(certificate_file);
				args.push_back("--p12-password");
				args.push_back(certificate_pass);
			}
			args.push_back("-v"); /* provide some more feedback */
			args.push_back(p_path);
			String str;
			int exitcode = 0;
			Error err = OS::get_singleton()->execute(rcodesign, args, &str, &exitcode, true);
			if (err != OK) {
				add_message(EXPORT_MESSAGE_WARNING, TTR("Code Signing"), TTR("Could not start rcodesign executable."));
				return err;
			}
			if (exitcode != 0) {
				print_line("rcodesign (" + p_path + "):\n" + str);
				add_message(EXPORT_MESSAGE_WARNING, TTR("Code Signing"), TTR("Code signing failed, see editor log for details."));
				return Error::FAILED;