Do not show 'max users' count for a MUC when it is 0 (unlimited)

The Openfire admin console contains various tables that display information of multi-user chat rooms. These rooms can, but need not have, a maximum number of users that it can contain. In table forms, this is usually shown in a 'users' column, as "12 / 30" (meaning: this room currently has 12 users in it, and has a maximum of 30).

Some rooms do not have a maximum. In such cases, Openfire should not display the second number (which will always be 0).

Instead of "12 / 0", the value "12" should be shown.