fix: handle nil credentials before clone

[gtwn]

can not clone parent client if not set credentials

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.81%. Comparing base (e158f04) to head (f00069c).
Report is 1 commits behind head on v3.

Additional details and impacted files

@@           Coverage Diff           @@
##               v3     #990   +/-   ##
=======================================
  Coverage   99.81%   99.81%           
=======================================
  Files          18       18           
  Lines        3882     3885    +3     
=======================================
+ Hits         3875     3878    +3     
  Misses          5        5           
  Partials        2        2           

Flag	Coverage Δ
unittests	99.81% <100.00%> (+<0.01%)	⬆️

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[jeevatkm]

@gtwn Thanks for the PR.