Instead of null checks, use default values for class parameters

[tadaspetra]

Describe the solution you'd like
There are some null checks within the code, that could be updated to have a default value in the data class constructor. This would make the code slightly more efficient as there would be one less null check

Describe alternatives you've considered
Just keeping the null checks, doesn't affect the code too much, would make it a little bit cleaner

[tadaspetra]

merged in #18