Fix: Let ConfigHashNormalizer normalize other properties when property is empty

[localheinz]

This PR

• asserts that the ConfigHashNormalizer normalizes other properties when a property is empty
• continues to normalizes other properties when a property is empty

[codecov]

Codecov Report

Merging #423 (4cc8b6d) into main (6b5d8c6) will not change coverage.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##                main      #423   +/-   ##
===========================================
  Coverage     100.00%   100.00%           
  Complexity       161       161           
===========================================
  Files             34        34           
  Lines            500       500           
===========================================
  Hits             500       500           

Impacted Files	Coverage Δ	Complexity Δ
src/Vendor/Composer/ConfigHashNormalizer.php	100.00% <100.00%> (ø)	5.00 <0.00> (ø)

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