allow empty password in client.yml

[wunter8]

fixes #374

[codecov-commenter]

Codecov Report

Base: 66.10% // Head: 66.08% // Decreases project coverage by -0.01% ⚠️

Coverage data is based on head (dfec18b) compared to base (24940f8).
Patch coverage: 14.28% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #434      +/-   ##
==========================================
- Coverage   66.10%   66.08%   -0.02%     
==========================================
  Files          35       35              
  Lines        3720     3721       +1     
==========================================
  Hits         2459     2459              
- Misses        908      909       +1     
  Partials      353      353              

Impacted Files	Coverage Δ
cmd/subscribe.go	29.87% <0.00%> (-0.20%)	⬇️
client/config.go	73.33% <100.00%> (ø)

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[binwiederhier]

Love it!