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This behaviour was allowed in
cb82dce86a
but then inexplicably removed a few months later in
https://github.com/discourse/onebox/pull/448, but showing
title-only oneboxes is valid. The original Meta topic that
this was discussed in was
https://meta.discourse.org/t/abc-news-not-oneboxing-due-to-missing-description/155933
.
This commit re-introduces allowing this behaviour to avoid the need for
a plugin,
c.f. https://meta.discourse.org/t/allow-title-only-onebox/354306
For example
<https://en-americas-support.nintendo.com/app/answers/detail/a_id/67660>
This commit also unhides onebox descriptions in chat, it's not
clear why they were ever hidden in the first place