### 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
} else {
				bose("rcodesign (" + p_path + "):\n" + str);
			}
		} break;
#ifdef MACOS_ENABLED
		case 3: { 
			bose("using xcode codesign...");
			if (!FileAccess::exists("/usr/bin/codesign") && !FileAccess::exists("/bin/codesign")) {
				add_message(EXPORT_MESSAGE_ERROR, TTR("Code Signing"), TTR("Xcode command line tools are not installed."));
				return Error::FAILED;
			}
			bool  (p_preset->get("codesign/identity") == "" || p_preset->get("codesign/identity") == "-");
			List<String> args;
			if (!ad_hoc) {
				args.push_back("--timestamp");
				args.push_back("--options");
				args.push_back("runtime");
			}
			if (p_path.get_extension() != "dmg") {
				args.push_back("--entitlements");
				args.push_back(p_ent_path);
			}
			PackedStringArray user_args = p_preset->get("codesign/custom_options");
			for (int i = 0; i < user_args.size(); i++) {
				String user_arg = user_args[i].strip_edges();
				if (!user_arg.is_empty()) {
					args.push_back(user_arg);
				}
			}
			args.push_back("-s");