Simplify assertions (ShouldContainKey already checks for null)

[bart-vmware]

QUALITY CHECKLIST

• N/A: Changes implemented in code
• Complies with our contributing guidelines
• Adapted tests
• N/A: Documentation updated

[codecov]

Codecov Report

Merging #1258 (9c0e69d) into master (ac7d3ae) will not change coverage.
The diff coverage is n/a.

❗ Current head 9c0e69d differs from pull request most recent head 8cad017. Consider uploading reports for the commit 8cad017 to get more accurate results

@@           Coverage Diff           @@
##           master    #1258   +/-   ##
=======================================
  Coverage   92.69%   92.69%           
=======================================
  Files         243      243           
  Lines        7815     7815           
=======================================
  Hits         7244     7244           
  Misses        571      571           

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