Comment 1 for bug 1960584

Saw this again when running the server suite locally on two new machines:
file:///root/.local/share/checkbox-ng/submission_2022-02-14T15.04.29.869154.html (H) Help
file:///root/.local/share/checkbox-ng/submission_2022-02-14T15.04.29.869154.junit.xml
WARNING:root:Transport skipped due to exporter error (/root/.local/share/checkbox-ng/submission_2022-02-14T15.04.29.869154.tar.xz)
WARNING:checkbox-ng.launcher.stages:Problem occured when preparing com.canonical.plainbox::tar report:['Expecting property name enclosed in double quotes: line 5416 column 19 (char 1735329)']
file:///root/.local/share/checkbox-ng/submission_2022-02-14T15.04.29.869154.junit.xml
Do you want to submit 'upload to certification' report?
  y => yes
  n => no
[yn]: y
Enter submission description (press Enter to skip): Initial Validation
WARNING:root:Transport skipped due to exporter error (https://certification.canonical.com/api/v1/submission/yWxS5NCiPTzwhym2Ycrf2X/)
WARNING:checkbox-ng.launcher.stages:Problem occured when preparing com.canonical.plainbox::tar report:['Expecting property name enclosed in double quotes: line 5417 column 19 (char 1735370)']
file:///root/.local/share/checkbox-ng/submission_2022-02-14T15.04.29.869154.junit.xml
ubuntu@octopot:~$

This was seen with the following config on two different machines:
Release: 20.04 LTS
ii checkbox-ng 1.16.0+git202201241420+pkg182~ubuntu20.04.1 all CheckBoxNG test runner
ii plainbox-provider-checkbox 0.63.0+git202202091055+pkg182~ubuntu20.04.1 amd64 CheckBox provider for PlainBox
ii python3-checkbox-ng 1.16.0+git202201241420+pkg182~ubuntu20.04.1 all CheckBoxNG test runner (Python 3 library)
ii python3-checkbox-support 0.53.0+git202202091035+pkg151~ubuntu20.04.1 all collection of Python modules used by PlainBox providers

When this occurs, the tarball is not created, and I've seen two different cases, the first case, .local/share/checkbox-ng only had the html and xml files but no other submission files, and on the second system, .local wasn't created at all (telling me checkbox never got as far as building the submission.

But both had the exact same error as noted in the summary.