Move course validation to back-end for efficiency #44
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At present, when a user clicks preview/export/publish, the front end attempts to validate the course by individually fetching every page/article/block/component and confirming they all have children.
For large courses this can easily send 500+ requests and take 8+ seconds.
Remove this, and instead validate the course as part of the publish (which is used in preview/export/publish tasks). The publish process already fetches course json, so check this for validity before proceeding with publish.
Return the same descriptive errors as before, these are displayed in an error modal.