Check for empty string when setting proxy override settings.

[nmoinvaz]

No description provided.

[codecov]

Codecov Report

Merging #23 (e931440) into master (95f581e) will decrease coverage by 1.32%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master      #23      +/-   ##
==========================================
- Coverage   52.40%   51.09%   -1.32%     
==========================================
  Files          53       53              
  Lines        4372     4402      +30     
  Branches     1018     1039      +21     
==========================================
- Hits         2291     2249      -42     
- Misses       1449     1525      +76     
+ Partials      632      628       -4     

Flag	Coverage Δ
macos	46.70% <0.00%> (-4.04%)	⬇️
ubuntu	43.56% <0.00%> (+0.29%)	⬆️
ubuntu_curl	44.11% <0.00%> (+0.65%)	⬆️
windows	54.70% <0.00%> (-0.05%)	⬇️

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Impacted Files	Coverage Δ
config.c	56.09% <0.00%> (-1.22%)	⬇️
resolver_mac.c	31.46% <0.00%> (-32.97%)	⬇️
config_mac.c	48.69% <0.00%> (-18.81%)	⬇️
test/proxycli.c	71.33% <0.00%> (-1.34%)	⬇️
util.c	77.77% <0.00%> (+0.63%)	⬆️
threadpool_pthread.c	82.55% <0.00%> (+0.67%)	⬆️
test/curl_proxyres.c	61.17% <0.00%> (+9.56%)	⬆️

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