Fix: Avoid use of empty()

[localheinz]

This PR

• avoids use of empty()

Follows #1.

[codecov]

Codecov Report

Merging #84 into master will not change coverage by %.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##             master      #84   +/-   ##
=========================================
  Coverage     93.50%   93.50%           
  Complexity       75       75           
=========================================
  Files             8        8           
  Lines           200      200           
=========================================
  Hits            187      187           
  Misses           13       13           

Impacted Files	Coverage Δ	Complexity Δ
src/FixtureFactory.php	90.69% <100.00%> (ø)	36.00 <0.00> (ø)

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