There does not appear to be any templates along the lines of "Stub" or "Under Construction" on this wiki. I say such a template would be useful to allow work to start on a subject not yet introduced, so that they need not be deleted just for being incomplete.
Most of the body of an article is some long pseudo-template in the DC Database namespace that has individual fields that are filled in by editors. In cases where some of those most important fields are blank (e.g. a plot summary for a comic or a character's history), then they are automatically tagged anyway. So if you're missing a character's hair color or a comic's release date, it's not a problem to publish as-is. I would recommend that if you're really trying to workshop something that isn't ready to go live, edit it in the user namespace, with something like User:Low Spark of Lyman/Sandbox.