ValueError must be AttributeError in __init__.py

[SessionIssue]

Pull Request check-list

Please make sure to review and check all of these items:

• Does $ tox pass with this change (including linting)?
• Do the CI tests pass with this change (enable it first in your forked repo and wait for the github action build to finish)?
• Is the new or changed code fully tested?
• Is a documentation update included (if this change modifies existing APIs, or introduces new ones)?
• Is there an example added to the examples folder (if applicable)?
• Was the change added to CHANGES file?

NOTE: these things are not required to open a PR and can be done
afterwards / while the PR is open.

Description of change

Please provide a description of the change here.

[codecov-commenter]

Codecov Report

Base: 92.24% // Head: 92.23% // Decreases project coverage by -0.00% ⚠️

Coverage data is based on head (a84e679) compared to base (a9ef0c5).
Patch coverage: 0.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2542      +/-   ##
==========================================
- Coverage   92.24%   92.23%   -0.01%     
==========================================
  Files         115      115              
  Lines       29548    29548              
==========================================
- Hits        27256    27254       -2     
- Misses       2292     2294       +2     

Impacted Files	Coverage Δ
redis/__init__.py	76.92% <0.00%> (ø)
tests/test_cluster.py	96.79% <0.00%> (-0.12%)	⬇️

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