Comment 1 for bug 1603825

Ah, this was actually part of the initial implementation of collapsible blocks: https://reviews.mahara.org/#/c/1678/

There's even a comment from Hugh about the "collapsible" setting on the config screen: "Perhaps add a rule so that a warning is shown when this is set with an empty title?" But it looks like we never followed up on that.

I'm not sure what the best solution is here. Display an empty title bar, with just the toggle control? Or disable the "collapsible" options when the block has no title?