Fix empty home feed before first follow has finished processing (#16152)

Change queue of merge worker from pull to default

app/models/concerns/account_interactions.rb

@@ -184,6 +184,14 @@ module AccountInteractions
     active_relationships.where(target_account: other_account).exists?
   end
 
+  def following_anyone?
+    active_relationships.exists?
+  end
+
+  def not_following_anyone?
+    !following_anyone?
+  end
+
   def blocking?(other_account)
     block_relationships.where(target_account: other_account).exists?
   end

app/models/user.rb

@@ -458,9 +458,7 @@ class User < ApplicationRecord
   end
 
   def regenerate_feed!
-    return unless Redis.current.setnx("account:#{account_id}:regeneration", true)
-    Redis.current.expire("account:#{account_id}:regeneration", 1.day.seconds)
-    RegenerationWorker.perform_async(account_id)
+    RegenerationWorker.perform_async(account_id) if Redis.current.set("account:#{account_id}:regeneration", true, nx: true, ex: 1.day.seconds)
   end
 
   def needs_feed_update?