aggregate bedpe not working when output file is not specified

According to the help text

```bash
-o, --output-file TEXT The default output file name to use. If this
isn'tspecified, clodius will replace the current
extensionwith .bed2db
```

but when I do

```bash
clodius aggregate bedpe -a hg38 --has-header outrageously-awesome-stuff.bedpe
```

I only see

```bash
output_file: None
plain
```

while I would expect get

```
outrageously-awesome-stuff.bed2ddb
```

but instead I get

```
outrageously-awesome-stuff.bedpe.multires.db
```

therefore I am

```
🤔
```