Hide write-only room user count

sites/+components/tbl-communities.php

@@ -51,6 +51,10 @@
 	</tr>
 <?php foreach ($rooms as $id => $room): ?>
 	<?php
+		/**
+		 * @var CommunityRoom $room
+		 */
+
 		if ($room->is_off_record()) {
 			// This can later allow SOGS
 			// to pass server-wide info using hidden dummy rooms.
@@ -71,6 +75,10 @@
 		$desc = html_sanitize($room->description);
 		$users = html_sanitize($room->active_users);
 		$users_cutoff = html_sanitize($room->format_user_cutoff_period());
+		$users_tooltip = $room->read
+			? "$users active users in the last $users_cutoff"
+			: "$users users with read privileges, ??? others";
+		$users = $room->read ? $users : "—";
 		$preview_link = html_sanitize($room->get_preview_url());
 		$join_link = html_sanitize($room->get_join_url());
 		$pubkey = html_sanitize($pubkey);
@@ -126,7 +134,7 @@
 		><?=$desc?></td>
 		<td
 			class="td_users"
-			title="<?=$users?> active users in the last <?=$users_cutoff?>."
+			title="<?=$users_tooltip?>."
 		><?=$users?></td>
 		<td class="td_preview">
 			<a