Feature 2673 sonarqube beta4 nullptr

[hsoh-u]

Expected Differences

SonarQube code smell: changed literal 0 to nullptr

• Do these changes introduce new tools, command line arguments, or configuration file options? [No]
  
  If yes, please describe:
  

• Do these changes modify the structure of existing or add new output data types (e.g. statistic line types or NetCDF variables)? [No]
  
  If yes, please describe:
  

Pull Request Testing

• Describe testing already performed for these changes:
  

ran unit test and got the same result

Checked if nullptr is at the wrong places:

find -type f -name "*h" -o -name "*hpp" -o -name "*cc" -exec grep nullptr {} \; | grep -v "\*) nullptr" | sort  | uniq | less

• Recommend testing for the reviewer(s) to perform, including the location of input datasets, and any additional instructions:
  

• Do these changes include sufficient documentation updates, ensuring that no errors or warnings exist in the build of the documentation? [No]

• Do these changes include sufficient testing updates? [No]

• Will this PR result in changes to the test suite? [No]
  
  If yes, describe the new output and/or changes to the existing output:
  

• Please complete this pull request review by [Fill in date].
  

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[jprestop]

I took quick look at the files. It looks like there is no testing for me to do. Thanks @hsoh-u for running the unit tests and verifying that you got the same result and for checking if nullptr was at the wrong places. Thank you for all of your work on these SonarQube findings.