Instead of just say “Failed to save entry” we’ll save the entry at all cost and try to fetch content. If fetching content failed, the entry will still be saved at least, but without content.
At the moment only Readability & wallabag v2 import allow created_at import.
Pocket removed `time_added` field from their API v2 to v3...
And wallabag v1 doesn't export that value.