### 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
int codesign_tool = p_preset->get("codesign/codesign");
	switch (codesign_tool) {
		case 1: { 
			bose("using built-in codesign...");
#ifdef MODULE_REGEX_ENABLED
			String error_msg;
			Error err = CodeSign::codesign(false, true, p_path, p_ent_path, error_msg);
			if (err != OK) {
				add_message(EXPORT_MESSAGE_WARNING, TTR("Code Signing"), vformat(TTR("Built-in CodeSign failed with error \"%s\"."), error_msg));
				return Error::FAILED;
			}
#else
			add_message(EXPORT_MESSAGE_WARNING, TTR("Code Signing"), TTR("Built-in CodeSign require regex module."));
#endif
		} break;
		case 2: { 
			bose("using rcodesign codesign...");
			String rcodesign = EDITOR_GET("export/macos/rcodesign").operator String();
			if (rcodesign.is_empty()) {