-j0 option broken in pylint 2.5.0 - ImportError: Unable to find module .... in sys.path

[crisbal]

Hello, the -j0 option is broken in pylint 2.5.0
This also breaks with any j > 1, thus when multiprocessing is enabled.

Steps to reproduce

# setup venv
cd /tmp
python -m venv venv
source venv/bin/activate
# install
pip install 'pylint==2.5.0'
# create some files
mkdir package
touch package/__init__.py
touch package/file.py
mkdir package/subpackage
touch package/subpackage/__init__.py

Current behavior

pylint --version
# pylint 2.5.0
# astroid 2.4.0
pylint -j0 ./package

Outputs the following:

Traceback (most recent call last):
  File "/tmp/venv/bin/pylint", line 10, in <module>
    sys.exit(run_pylint())
  File "/tmp/venv/lib/python3.8/site-packages/pylint/__init__.py", line 22, in run_pylint
    PylintRun(sys.argv[1:])
  File "/tmp/venv/lib/python3.8/site-packages/pylint/lint/run.py", line 338, in __init__
    linter.check(args)
  File "/tmp/venv/lib/python3.8/site-packages/pylint/lint/pylinter.py", line 874, in check
    check_parallel(
  File "/tmp/venv/lib/python3.8/site-packages/pylint/lint/check_parallel.py", line 100, in check_parallel
    for module, messages, stats, msg_status in pool.imap_unordered(
  File "/usr/lib/python3.8/multiprocessing/pool.py", line 865, in next
    raise value
ImportError: Unable to find module for package/file.py in /tmp/venv/bin, 
/usr/lib/python38.zip, 
/usr/lib/python3.8, 
/usr/lib/python3.8/lib-dynload, 
/tmp/venv/lib/python3.8/site-packages, 
/tmp/venv/lib/python3.8/site-packages/astroid/brain

Running:

pylint  ./package
# no output, it works

Expected behavior

In version pylint-2.4.4/astroid-2.3.3 it was working fine.

pip install 'pylint==2.4.4'
pylint --version
# pylint 2.4.4
# astroid 2.3.3
pylint -j0 ./package
# no output, it works

pylint --version output

pylint 2.5.0
astroid 2.4.0
Python 3.8.2 (default, Apr  8 2020, 14:31:25) 
[GCC 9.3.0]

[crisbal]

Duplicate of #3524