Add eask-help-error command

Author: joshbax189

lisp/_prepare.el

@@ -1872,6 +1872,11 @@ Arguments FNC and ARGS are used for advice `:around'."
             (eask--help-display)))
       (eask-error "Help manual missing %s" help-file))))
 
+(defun eask-help-error (command)
+  "Display help for COMMAND and exit with error status."
+  (eask-help command)
+  (eask--exit))
+
 ;;
 ;;; Checker