Empty messages groups cause issues

Example:

■ Main ■ 0:00:07 [5] USENET [1] alt.2600: /*

Message Groups                                            Sub-boards

  [1] Main                                                     8
  [2] DOVE-Net                                                23
  [3] FidoNet                                                 81
  [4] fsxNet                                                  12
* [5] test                                                     0
  [6] USENET Newsgroups                                       16

■ Main ■ 0:00:19 [5] USENET [1] alt.2600: /5
■ Main ■ 0:00:22 [5] USENET [1] alt.2600: *

Sub-boards of test                                           Posts


■ Main ■ 0:00:25 [5] USENET [1] alt.2600:

Empty File Libraries likely present a similar issue.

Reported by deon (ALTERANT) on DOVE-Net.

assigned to @rswindell

Empty File Libraries do not have this same issue because have and use user_can_access_lib() in js_file_area.c when creating the file_area.lib_list[] which filters empty libraries already.

closed with commit 90b95db7

mentioned in commit 90b95db7