fix linting to make stree happy

lib/assigner.rb

@@ -461,10 +461,13 @@ class ::Assigner
 
   def invite_group(group)
     return if topic.topic_allowed_groups.exists?(group_id: group.id)
-    return if topic.all_allowed_users
+    if topic
+         .all_allowed_users
          .joins("RIGHT JOIN group_users ON group_users.user_id = users.id")
          .where("group_users.group_id = ? AND users.id IS NULL", group.id)
-                .empty? # all group members can already see the topic
+         .empty?
+      return # all group members can already see the topic
+    end
 
     guardian.ensure_can_invite_group_to_private_message!(group, topic)
     topic.invite_group(@assigned_by, group)

spec/lib/assigner_spec.rb

@@ -747,7 +747,8 @@ RSpec.describe Assigner do
 
     it "doesn't invite group if all members have access to the PM already" do
       user1, user2, user3 = 3.times.collect { Fabricate(:user) }
-      group1, group2, group3 = 3.times.collect do
+      group1, group2, group3 =
+        3.times.collect do
           Fabricate(
             :group,
             assignable_level: Group::ALIAS_LEVELS[:only_admins],