fix(null-checks): fixed nullchecks to throw nullpointer exceptions

Callum Granrequested to merge
fix/null-check into main

closes: #18 (closed)

What are the key features of this change

Title says it all.

Checklist

  • Javadoc
  • Relevant tests have been created
  • Build tool test passed
  • Class version is updated where relevant
Edited by Callum Gran

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