"del <varname>" in the console is broken

[gdementen]

The variable is not removed from the varlist and thus the editor tries to display it on update which evidently fails. Then redefining the variable adds it a second time in the varlist leading to all kinds of "interesting" problems 😭. Very annoying.

[gdementen]

Well, it was not as important as I thought, as there was a problem only for "undisplayable" variables, which should be very rare for users. I fixed it anyway.