Fix issue#482 plagiarism_turnitin_config

[TomoTsuyuki]

Fix the issue #482

[TomoTsuyuki]

This needs to be deployed with #585 to fix all of issues for #482

[dwinn]

Hi @TomoTsuyuki ,

Thank you for your contribution.

I am a little concerned that this does not check for existing values in the database before changing the index. See how #585 does so. Maybe that needs to be in the code here to prevent issues if there is a null value for that field.

[TomoTsuyuki]

Hi @dwinn ,

Thanks for checking my PR.
I updated the code to check the field before changing index as #585 .

[dwinn]

Hi @TomoTsuyuki,

Thank you for the quick update, was just about to make the change myself as we're keen to get this out in our next release but then I saw you updated. We are in the final stages of preparing a release with some other community pull requests, currently aiming for early next week.

[TomoTsuyuki]

Hi @dwinn

Thank for merging.
Hope the update will save many people :)