Revert "Check for empty string when setting proxy override settings."

[nmoinvaz]

Reverts #23

Setting it to emtpy string should override it system settings.

[codecov]

Codecov Report

Merging #29 (589e4a5) into master (838e0fd) will decrease coverage by 2.20%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master      #29      +/-   ##
==========================================
- Coverage   51.90%   49.70%   -2.20%     
==========================================
  Files          49       53       +4     
  Lines        4150     4482     +332     
  Branches      975     1050      +75     
==========================================
+ Hits         2154     2228      +74     
- Misses       1393     1608     +215     
- Partials      603      646      +43     

Flag	Coverage Δ
macos	47.67% <0.00%> (∅)
ubuntu	44.64% <0.00%> (ø)
ubuntu_curl	45.05% <0.00%> (ø)
windows	52.36% <0.00%> (-2.99%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
config.c	57.31% <0.00%> (-0.19%)	⬇️
config_win.c	59.25% <0.00%> (-24.08%)	⬇️
resolver_win8.c	38.70% <0.00%> (-16.13%)	⬇️
test/proxycli.c	59.33% <0.00%> (-10.67%)	⬇️
util.c	75.52% <0.00%> (-0.94%)	⬇️
resolver.c	50.75% <0.00%> (-0.02%)	⬇️
wpad_dns.c	32.35% <0.00%> (ø)
wpad_dhcp.c	0.00% <0.00%> (ø)
config_mac.c	46.28% <0.00%> (ø)
... and 7 more

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