JSONDecodeError on many profiles

## Library version

```
instalooter v2.4.4
```

## Environment

* Arch Linux
* CPython 3.9.2

## Error description - runtime

### Reproducible test case

```python
from instalooter.looters import ProfileLooter
pl=ProfileLooter("tgmmememaster")
for media in pl.medias():
pass
```

### Expected behaviour

Instalooter iterates through the medias without failing. Perhaps a more specific exception would be nice, if there's truly something wrong on insta's end.

### Actual behaviour

An exception gets thrown, possibly because of some corrupt JSON.