Fix: ui/doom-modeline: segment bar has to return "" in any case to not break -nw

Amoriello found this fix in issue #170

modules/ui/doom-modeline/config.el

@@ -522,16 +522,18 @@ with `evil-ex-substitute', and/or 4. The number of active `iedit' regions."
              (image-size (image-get-display-property) :pixels)
            (format "  %dx%d  " width height)))))
 
-;; The bar regulates the height of the mode-line in GUI Emacs.
 (def-modeline-segment! bar
-  (when (display-graphic-p)
+  "The bar regulates the height of the mode-line in GUI Emacs.
+Returns \"\" to not break --no-window-system."
+  (if (display-graphic-p)
       (+doom-modeline--make-xpm
        (face-background (if (active)
                             'doom-modeline-bar
                           'doom-modeline-inactive-bar)
                         nil t)
        +doom-modeline-height
-     +doom-modeline-bar-width)))
+       +doom-modeline-bar-width)
+    ""))
 
 
 ;;