[MP2]

pawn Код:

for(new i=0; i<GetMaxPlayers(); i++)
{
    if(!IsPlayerConnected(i)) continue; // Not connected, continue
    if(!pLevel[i]) continue; // Not admin, continue
    if(!count) format(string, sizeof(string), "%s", pName[i]); // The first
    else format(string, sizeof(string), "\n%s", pName[i]); // Not the first, start with \n
    count++;
}
if(!count) return ShowPlayerDialog(.. no admins online ..); // No admins, display the 'no admins' dialog and stop the script there (return)
ShowPlayerDialog(playerid, dialogid, DIALOG_STYLE_LIST, "Admins Online:", string, "OK", ""); // Script carried on, show list of admins

Rushed, should work though.