Fixing exception in listen

[dvora-h]

Pull Request check-list

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• Does $ tox pass with this change (including linting)?
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Description of change

closes #1788

[codecov-commenter]

Codecov Report

Merging #1823 (931eb03) into master (271218e) will decrease coverage by 0.03%.
The diff coverage is 50.00%.

@@            Coverage Diff             @@
##           master    #1823      +/-   ##
==========================================
- Coverage   94.33%   94.30%   -0.04%     
==========================================
  Files          75       75              
  Lines       15830    15837       +7     
==========================================
+ Hits        14934    14935       +1     
- Misses        896      902       +6     

Impacted Files	Coverage Δ
redis/client.py	89.87% <50.00%> (-0.10%)	⬇️
tests/conftest.py	90.14% <0.00%> (-0.99%)	⬇️
tests/test_cluster.py	98.67% <0.00%> (-0.13%)	⬇️
redis/cluster.py	90.23% <0.00%> (-0.07%)	⬇️

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