### 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
Ref<FileAccess> f = FileAccess::open(p_path, FileAccess::READ_WRITE);
	if (f.is_null()) {
		add_message(EXPORT_MESSAGE_ERROR, TTR("PCK Embedding"), vformat(TTR("Failed to open executable file \"%s\"."), p_path));
		return ERR_CANT_OPEN;
	}
	
	{
		uint32_t magic = f->get_32();
		if (magic != 0x464c457f) { 
			add_message(EXPORT_MESSAGE_ERROR, TTR("PCK Embedding"), TTR("Executable file header corrupted."));
			return ERR_FILE_CORRUPT;
		}
	}
	
	int bits = f->get_8() * 32;
	if (bits == 32 && p_embedded_size >= 0x100000000) {
		add_message(EXPORT_MESSAGE_ERROR, TTR("PCK Embedding"), TTR("32-bit executables cannot have embedded data >= 4 GiB."));
	}
	
	int64_t section_table_pos;
	int64_t section_header_size;
	if (bits == 32) {
		section_header_size = 40;
		f->seek(0x20);
		section_table_pos = f->get_32();
		f->seek(0x30);
	} else { 
		section_header_size = 64;