### 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
String file = String::utf8(fname);
		Vector<uint8_t> data;
		data.resize(info.uncompressed_size);
		// Read.
		unrentFile(src_pkg_zip);
		unzReadCurrentFile(src_pkg_zip, data.ptrw(), data.size());
		unzCloseCurrentFile(src_pkg_zip);
		// Write.
		fe.replace_first("macos_template.app/", "");
		if (((info.external_fa >> 16L) & 0120000) == 0120000) {
#ifndef UNIX_ENABLED
			add_message(EXPORT_MESSAGE_INFO, TTR("Export"), TTR("Relative symlinks are not supported on this OS, the exported project might be broken!"));
#endif
			// Handle symlinks in the archive.
			file = tmp_app_path_name.path_join(file);
			= OK) {
				err = tmp_app_dir->make_dir_recursive(file.get_base_dir());
				if (err != OK) {
					add_message(EXPORT_MESSAGE_ERROR, TTR("Export"), vformat(TTR("Could not create directory \"%s\"."), file.get_base_dir()));
				}
			}
			= OK) {
				String lnk_data = String::utf8((const char *)data.ptr(), data.size());
				err = tmp_app_dir->create_link(lnk_data, file);
				if (err != OK) {
					add_message(EXPORT_MESSAGE_ERROR, TTR("Export"), vformat(TTR("Could not created symlink \"%s\" -> \"%s\"."), lnk_data, file));
				}
				bose(vformat("ADDING SYMLINK %s => %s\n", file, lnk_data));
			}
			ret = unzGoToNextFile(src_pkg_zip);