Add test case for the empty proxy bypass list configured

[sergio-nsk]

Simplify other config test cases with using predicate assertions instead of expectations.

This should fix the degrading coverage report in #13

Impacted Files	Coverage Δ
config.c	56.09% <0.00%> (-1.22%)	⬇️

[codecov]

Codecov Report

Merging #15 (8010dc2) into master (8841c3a) will increase coverage by 0.04%.
The diff coverage is 46.66%.

@@            Coverage Diff             @@
##           master      #15      +/-   ##
==========================================
+ Coverage   52.32%   52.36%   +0.04%     
==========================================
  Files          53       53              
  Lines        4369     4369              
  Branches     1021     1020       -1     
==========================================
+ Hits         2286     2288       +2     
  Misses       1449     1449              
+ Partials      634      632       -2     

Flag	Coverage Δ
macos	50.69% <46.66%> (+0.08%)	⬆️
ubuntu	43.22% <46.66%> (+0.07%)	⬆️
ubuntu_curl	43.42% <46.66%> (+0.10%)	⬆️
windows	54.76% <42.85%> (+0.08%)	⬆️

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Impacted Files	Coverage Δ
test/test_config.cc	59.25% <46.66%> (+3.70%)	⬆️
config.c	57.31% <0.00%> (+1.21%)	⬆️

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