More handling null IIS rows in contacts, a=chris

diff --git a/src/controllers/components/SocialComponent.php b/src/controllers/components/SocialComponent.php
index a9c3a0f67..73332c10e 100644
--- a/src/controllers/components/SocialComponent.php
+++ b/src/controllers/components/SocialComponent.php
@@ -2152,7 +2152,7 @@ class SocialComponent extends Component implements CrawlConstants
             $chat_stamp = $impression_model->mostRecentThreadView($user_id,
                 $chat_id);
             if (empty($chat_stamp)) {
-                continue;
+                $chat_stamp = 0;
             }
             $contacts[$contact_id] = [
                 "USER_NAME" => $contact_username,