Fix: Invert condition to expose happy path

[localheinz]

This PR

• inverts a condition to expose the happy path

Follows #1.

[codecov]

Codecov Report

Merging #54 into master will decrease coverage by 0.03%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##             master      #54      +/-   ##
============================================
- Coverage     93.81%   93.78%   -0.04%     
  Complexity       80       80              
============================================
  Files             8        8              
  Lines           194      193       -1     
============================================
- Hits            182      181       -1     
  Misses           12       12

Impacted Files	Coverage Δ	Complexity Δ
src/EntityDef.php	95% <100%> (-0.13%)	17 <0> (ø)

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