Minor clazy/clang-tidy edits.

8 jobs for json_parser in 19 minutes and 58 seconds (queued for 1 second)
Name Stage Failure
failed
linux_analysis Analysis
   Uploaded: /home/gitlab-runner/builds/3f7f1a15/0/jap/radix/build/Testing/20200403-1447/Build.xml
Uploaded: /home/gitlab-runner/builds/3f7f1a15/0/jap/radix/build/Testing/20200403-1447/Coverage.xml
Uploaded: /home/gitlab-runner/builds/3f7f1a15/0/jap/radix/build/Testing/20200403-1447/CoverageLog-0.xml
Uploaded: /home/gitlab-runner/builds/3f7f1a15/0/jap/radix/build/Testing/20200403-1447/CoverageLog-1.xml
Uploaded: /home/gitlab-runner/builds/3f7f1a15/0/jap/radix/build/Testing/20200403-1447/DynamicAnalysis.xml
Uploaded: /home/gitlab-runner/builds/3f7f1a15/0/jap/radix/build/Testing/20200403-1447/Test.xml
Submission successful
Errors while running CTest
ERROR: Job failed: exit status 1