Improve oembed errors handling (no hidden error, CORS) #2254
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This PR improve oembed errors handling and fixes #2255.
This one has been detected while working on https://github.com/etalab/datagouv-search-indicator: one of the dataset have been removed (INSEE legacy SIRENE dataset) and this prevent from requesting oembed for this dataset (or more precisely from seing it's a 404 and the dataset does not exists anymore)
Note: this fixes specific error case on oembed but in order to have CORS on all errors a fix is required on flask-restplus