command mode throws error on delete or C-g
When is entered in ex (or command mode) with ':', and pressed Backspace or C-g, emacs will report error:
Debugger entered--Lisp error: (quit) read-from-minibuffer(":" nil (keymap (63) (14 . evil-ex-run-completion-at-point)... evil-ex() call-interactively(evil-ex nil nil)
The same issue ariese when something is entered in command, and manualy delete it (with backspace): when backspace hits ':', above is reported.