El estilo actual es:
.modal.history-modal table.markdown\u003etbody\u003etr\u003etd, .modal.history-modal .revision-content {
width: 47.5%;
float: left;
}
Lo que se rompe cuando no hay texto en la celda izquierda (ejemplo: https://meta.discourse.org/t/welcome-to-meta-discourse-org/1):
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@awesomerobot In case this slipped by (I understand if it’s not a priority)
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Looks like you are 90% there solving this bug, why don’t you do the missing 10% and submit a pull request with a fix? 
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Done: https://github.com/discourse/discourse/pull/12489
I never know when I should do it myself or when the team prefers to do it 
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It’s always best to ask if we aren’t planning on working on it in order to avoid working for nothing.
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It’s now fixed 
Thanks a lot @Nacho_Caballero 
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