Console: do not index nonexistent character codes

src/hulk/console.d

@@ -125,6 +125,10 @@ struct Console
      */
     private static void render_char(size_t x, size_t y, char ch)
     {
+        if (ch > 127)
+        {
+            ch = 0u;
+        }
         const(CharInfo) * ci = &Kfont.chars[ch];
         Fb.blit_alpha_bitmap(x + ci.left, y + ci.top, ci.bitmap, ci.width, ci.height);
     }