Ignore activity for download without user

Signed-off-by: Israel Barreto Sant'Anna <ibsa14@inf.ufpr.br>

app/models/download.rb

@@ -17,9 +17,15 @@ class Download < ApplicationRecord
   belongs_to :downloadable, polymorphic: true, counter_cache: true
   belongs_to :user, optional: true
 
-  validates_presence_of :ip, :downloadable
+  validates :ip, :downloadable, presence: true
 
   def recipient
     downloadable
   end
+
+  private
+
+  def new_create_activity
+    new_activity(:create) unless user.nil?
+  end
 end