fix exception on anon viewing reply form

app/controllers/comments_controller.rb

@@ -6,7 +6,7 @@ class CommentsController < ApplicationController
   caches_page :index, :threads, if: CACHE_PAGE
 
   before_action :require_logged_in_user_or_400,
-    only: [:create, :preview, :upvote, :flag, :unvote]
+    only: [:create, :preview, :reply, :upvote, :flag, :unvote, :update]
   before_action :require_logged_in_user, only: [:upvoted]
   before_action :flag_warning, only: [:user_threads]
   before_action :show_title_h1
@@ -136,7 +136,7 @@ class CommentsController < ApplicationController
     else
       parents = comment.parents.with_thread_attributes.for_presentation
 
-      @votes = Vote.comment_votes_by_user_for_comment_ids_hash(@user.id, parents.map(&:id))
+      @votes = Vote.comment_votes_by_user_for_comment_ids_hash(@user&.id, parents.map(&:id))
       parents.each { |c| c.current_vote = @votes[c.id] }
       render "_commentbox", locals: {
         comment: comment,
@@ -272,11 +272,8 @@ class CommentsController < ApplicationController
       .limit(COMMENTS_PER_PAGE)
       .offset((@page - 1) * COMMENTS_PER_PAGE)
 
-    if @user
-      @votes = Vote.comment_votes_by_user_for_comment_ids_hash(@user.id, @comments.map(&:id))
-
-      @comments.each { |c| c.current_vote = @votes[c.id] }
-    end
+    @votes = Vote.comment_votes_by_user_for_comment_ids_hash(@user&.id, @comments.map(&:id))
+    @comments.each { |c| c.current_vote = @votes[c.id] } unless @votes.empty?
 
     respond_to do |format|
       format.html { render action: "index" }
@@ -318,9 +315,7 @@ class CommentsController < ApplicationController
     # TODO: respect hidden stories
 
     @votes = Vote.comment_votes_by_user_for_comment_ids_hash(@user.id, @comments.map(&:id))
-    @comments.each do |c|
-      c.current_vote = @votes[c.id]
-    end
+    @comments.each { |c| c.current_vote = @votes[c.id] }
 
     respond_to do |format|
       format.html { render action: :index }

app/models/vote.rb

@@ -79,16 +79,14 @@ class Vote < ApplicationRecord
   end
 
   def self.comment_votes_by_user_for_comment_ids_hash(user_id, comment_ids)
-    if comment_ids.empty?
-      {}
-    else
-      votes = where(
-        user_id: user_id,
-        comment_id: comment_ids
-      )
-      votes.each_with_object({}) do |v, memo|
-        memo[v.comment_id] = {vote: v.vote, reason: v.reason}
-      end
+    return {} if user_id.nil? || comment_ids.empty?
+
+    votes = where(
+      user_id: user_id,
+      comment_id: comment_ids
+    ).select(:comment_id, :vote, :reason)
+    votes.each_with_object({}) do |v, memo|
+      memo[v.comment_id] = {vote: v.vote, reason: v.reason}
     end
   end