fix/urgent: downloads not working if no terminal attached

[Kinsteen]

Description

This fixes the issue where downloads are not working from the app.

shutil.get_terminal_size() will never raise an exception. If no terminal is used, then it will fallback to a size of (80, 24) per default, which will fix the problem as os.get_terminal_size() raises an exception if there is no terminal.

Fixes a lot of issues

NOTE: should be merged ASAP and released, as downloads being not available from the app is quite blocking.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

Please describe the tests that you ran to verify your changes.
Provide instructions so we can reproduce.

• locally

[github-actions]

Pylint result on modfied files:

------------- Module bottles.backend.downloader
bottles/backend/downloader.py:20:0: E0401: Unable to import 'requests' (import-error)
bottles/backend/downloader.py:21:0: E0401: Unable to import 'gi.repository' (import-error)
bottles/backend/downloader.py:103:29: C0321: More than one statement on a single line (multiple-statements)
bottles/backend/downloader.py:30:0: R0903: Too few public methods (1/2) (too-few-public-methods)
bottles/backend/downloader.py:30:0: W0612: Unused variable 'Downloader' (unused-variable)

Your code has been rated at 8.03/10