### 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
switch (codesign_tool) {
			case 1: { 
				 true;
			} break;
			case 2: { 
				 p_preset->get("codesign/certificate_file").operator String().is_empty() || p_preset->get("codesign/certificate_password").operator String().is_empty();
			} break;
#ifdef MACOS_ENABLED
			case 3: { 
				 (p_preset->get("codesign/identity") == "" || p_preset->get("codesign/identity") == "-");
			} break;
#endif
			default: {
			};
		}
		String pack_path = tmp_app_path_name + "/Contents/Resources/" + pkg_name + ".pck";
		Vector<SharedObject> shared_objects;
		err = save_pack(p_preset, p_debug, pack_path, &shared_objects);
		bool lib_validation = p_preset->get("codesign/entitlements/disable_library_validation");
		if (!shared_objects.is_empty() && sign_enabled && ad_hoc && !lib_validation) {
			add_message(EXPORT_MESSAGE_INFO, TTR("Entitlements Modified"), TTR("Ad-hoc signed applications require the 'Disable Library Validation' entitlement to load dynamic libraries."));
			lib_validation = true;
		}
		String ent_path = p_preset->get("codesign/entitlements/custom_file");
		String hlp_ent_path = EditorPaths::get_singleton()->get_cache_dir().path_join(pkg_name + "_helper.entitlements");
		if (sign_enabled && (ent_path.is_empty())) {
			ent_path = EditorPaths::get_singleton()->get_cache_dir().path_join(pkg_name + ".entitlements");
			Ref<FileAccess> ent_f = FileAccess::open(ent_path, FileAccess::WRITE);
			if (ent_f.is_valid()) {
				ent_f->store_line("<?xml version=\"1.0\" encoding=\"UTF-8\"?>");