Fixed bug in exclusion filtering

[codders]

Exclusions code was returning no exposes if no exclusions were configured
Added test for Hunter class

[codecov-commenter]

Codecov Report

Merging #4 into master will increase coverage by 10.07%.
The diff coverage is 84.61%.

@@             Coverage Diff             @@
##           master       #4       +/-   ##
===========================================
+ Coverage   49.16%   59.24%   +10.07%     
===========================================
  Files           7        7               
  Lines         421      422        +1     
  Branches       49       49               
===========================================
+ Hits          207      250       +43     
+ Misses        206      158       -48     
- Partials        8       14        +6     

Impacted Files	Coverage Δ
flathunter/hunter.py	38.38% <84.61%> (+38.38%)	⬆️
flathunter/crawl_immowelt.py	63.76% <0.00%> (+7.24%)	⬆️

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[mordax7]

LGTM