fix: typo in error handling

[tanmaykm]

Fixed a typo in error handling code.
Minor change to use === for equality with nothing.

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (cd48768) 73.59% compared to head (c334d8a) 73.59%.
Report is 2 commits behind head on master.

❗ Current head c334d8a differs from pull request most recent head 0eff6b9. Consider uploading reports for the commit 0eff6b9 to get more accurate results

Files	Patch %	Lines
src/client.jl	66.66%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #98   +/-   ##
=======================================
  Coverage   73.59%   73.59%           
=======================================
  Files           6        6           
  Lines         356      356           
=======================================
  Hits          262      262           
  Misses         94       94           

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[tanmaykm]

The codecov check failure in CI doesn't seem too important, no new code lines were added in this PR.

[jkaye2012]

Might be worth disabling the coverage % check? I like having the coverage reported, but I'm not sure that a minimum bar per diff makes sense as you've said.

[tanmaykm]

Okay, with 0eff6b9 codecov should report but not fail the CI

[tanmaykm]

I guess we can merge this if there are no further comments?