Drafts Folder Disappearing in Apple Mail

For whatever reason, the draft folder spontaneously disappears from the folder list in Apple Mail, even though I have draft emails saved to that folder. The only way for me to view/edit those drafts is to create another draft, which triggers the folder to reappear.

Does anyone know why this happens? I only want to the draft folder to disappear from view when I don't have any draft emails saved in it. Otherwise, I obviously need it visible so that I can access those saved emails.

I'm running Yosemite with full updates. Any advice would be greatly appreciated!