"Exception: Family I B M Plex Sans does not exist on Google Fonts!"

When I try to diff IBM Plex Sans Bold, I get the following error:

```
500 error
Submit following traceback to the GF Regression repo

Traceback (most recent call last):
File "/usr/local/lib/python3.7/site-packages/flask/app.py",
line 2292, in wsgi_app response = self.full_dispatch_request()
File "/usr/local/lib/python3.7/site-packages/flask/app.py",
line 1815, in full_dispatch_request rv = self.handle_user_exception(e)
File "/usr/local/lib/python3.7/site-packages/flask/app.py",
line 1718, in handle_user_exception reraise(exc_type, exc_value, tb)
File "/usr/local/lib/python3.7/site-packages/flask/_compat.py",
line 35, in reraise raise value
File "/usr/local/lib/python3.7/site-packages/flask/app.py",
line 1813, in full_dispatch_request rv = self.dispatch_request()
File "/usr/local/lib/python3.7/site-packages/flask/app.py",
line 1799, in dispatch_request return self.view_functions[rule.endpoint](**req.view_args)
File "./main.py",
line 67, in upload_fonts family_before = family.from_googlefonts(family_after.name)
File "./family.py",
line 239, in from_googlefonts fonts = downloadfonts.googlefonts(family_name)
File "./downloadfonts.py",
line 24, in googlefonts raise Exception('Family {} does not exist on Google Fonts!'.format(family)) Exception: Family I B M Plex Sans does not exist on Google Fonts!

```

Is the `I B M` supposed to have spaces in it here, or could this be a relatively simple name-parsing / string-manipulation issue?