getting error CRITICAL 'NoneType' object has no attribute 'group' while fetching content

## Library version

*What's the installed library version ? Check with `instalooter --version`*:

```
instalooter v2.4.4
```

## Environment

*Describe here your environment, including:*

* *OS*
* *Python version*
* *`setuptools` version if reporting an issue with installation*
* *non-standard Python implementation if any*

## Error description - runtime
$ instalooter hashtag memes /home/devops/insta/memes -V
2021-07-17 12:18:05 kali instalooter.cli[1725] NOTICE Starting download of `memes`
0it [00:00, ?it/s]
2021-07-17 12:18:07 kali instalooter.cli[1725] CRITICAL 'NoneType' object has no attribute 'group'
2021-07-17 12:18:07 kali instalooter.cli[1725] NOTICE Terminating 16 remaining workers...

### Reproducible test case

*Are you using the CLI ? If so, include a command that can be used to re-raise the
error, with actual arguments anybody can try:*

```
instalooter hashtag memes /home/devops/insta/memes -V
```