Dear Maintainer,
When Subdownloader starts, there's a dialog:
any film (like Plan 9 from Outer Space but it happens with any film), selecting
the [English (US)] subtitle, right clicking on the listing and choosing
Download and then finally clicking on the Choose button causes Subdownloader to
crash with the following error in the terminal:
```
Traceback (most recent call last): File "/usr/lib/python3/dist-
packages/subdownloader/client/gui/widgets/searchNameWidget.py", line 181, in
onButtonDownloadByTitle
data_stream =
sub.download(provider_instance=self.get_state().get_OSDBServer(),
callback=callback)
File "/usr/lib/python3/dist-packages/subdownloader/provider/SDService.py",
line 682, in download
return BytesIO(subs[0])
TypeError: 'NoneType' object is not subscriptable
```