RSS comments feed doesn't mis-convert HTML as Markdown
RSS comments feed doesn't mis-convert HTML as Markdown

Fixes https://sentry.io/organizations/lesswrong/issues/887883618 , which
happens on empty comments. Also fixes the RSS comments feed going
through a markdown-to-HTML conversion despite already being HTML.

Discordius/Telescope,Discordius/Lesswrong2,Discordius/Telescope,Discordius/Telescope,Discordius/Lesswrong2,Discordius/Telescope,Discordius/Lesswrong2,Discordius/Lesswrong2