Add NullEngine.

[dereuromark]

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[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 94.23077% with 3 lines in your changes missing coverage. Please review.

Project coverage is 84.12%. Comparing base (225ee10) to head (f72a5fa).

Files	Patch %	Lines
src/Engine/NullEngine.php	94.44%	1 Missing ⚠️
src/Model/Behavior/CaptchaBehavior.php	95.45%	1 Missing ⚠️
src/View/Helper/CaptchaHelper.php	83.33%	1 Missing ⚠️

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Additional details and impacted files

@@             Coverage Diff              @@
##             master      #45      +/-   ##
============================================
- Coverage     84.53%   84.12%   -0.42%     
- Complexity      116      129      +13     
============================================
  Files            12       14       +2     
  Lines           388      422      +34     
============================================
+ Hits            328      355      +27     
- Misses           60       67       +7     

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