ISTWCMS-4214: removing unset when using third party settings as was causing...

Eric Bremnerrequested to merge
feature/ISTWCMS-4214-ebremner-fix-banners into 7.x-1.x

ISTWCMS-4214: removing unset when using third party settings as was causing errors in display and saving banners

Can be tested at: https://wms-profiles.uwaterloo.ca/demo-single-page

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