prevented delegation errors for users without a community user (data errors - we used to hard delete)

Author: Oaphi

app/models/user.rb

@@ -38,7 +38,7 @@ class User < ApplicationRecord
 
   validates :login_token, uniqueness: { allow_blank: true, case_sensitive: false }
 
-  delegate :reputation, :reputation=, :privilege?, :privilege, to: :community_user
+  delegate :reputation, :reputation=, :privilege?, :privilege, to: :community_user, allow_nil: true
 
   alias_attribute :name, :username
 
@@ -57,6 +57,12 @@ def self.search(term)
     where('username LIKE ?', "%#{sanitize_sql_like(term)}%")
   end
 
+  # Safely gets the user's reputation even if they don't have a community user
+  # @return [Integer] user's reputation
+  def reputation
+    community_user&.reputation || 1
+  end
+
   # Safely gets the user's trust level even if they don't have a community user
   # @return [Integer] user's trust level
   def trust_level
@@ -208,6 +214,8 @@ def can_update?(post, post_type)
   end
 
   def metric(key)
+    return 0 unless community_user
+
     Rails.cache.fetch("community_user/#{community_user.id}/metric/#{key}", expires_in: 24.hours) do
       case key
       when 'p'