TypeError: can't access property "grade_levels", e is undefined

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Sentry Issue: STUDIO-JTC

TypeError: can't access property "grade_levels", e is undefined
  at getMergedMapFields (./shared/utils/helpers.js:650:37)
  at updateContentNode (./channelEdit/vuex/contentNode/actions.js:396:10)
  at xY.methods.inheritMetadata (channelEdit/views/CurrentTopicView.vue:1026:1)
  at AR.methods.handleContinue (channelEdit/components/edit/InheritAncestorMetadataModal.vue:296:1)
  at AR.methods.checkInheritance (channelEdit/components/edit/InheritAncestorMetadataModal.vue:200:1)
...
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