Actualiza a Redmine 3.4.13

app/helpers/application_helper.rb

@@ -1272,7 +1272,7 @@ module ApplicationHelper
     link_to_function '',
       "toggleCheckboxesBySelector('#{selector}')",
       :title => "#{l(:button_check_all)} / #{l(:button_uncheck_all)}",
-      :class => 'toggle-checkboxes'
+      :class => 'icon icon-checked'
   end
 
   def progress_bar(pcts, options={})
@@ -1423,10 +1423,13 @@ module ApplicationHelper
       end
       if email.present?
         gravatar(email.to_s.downcase, options) rescue nil
-      else
+      elsif user.is_a?(AnonymousUser)
+        options[:size] &&= options[:size].to_s
         image_tag 'anonymous.png',
                   GravatarHelper::DEFAULT_OPTIONS
                     .except(:default, :rating, :ssl).merge(options)
+      else
+        nil
       end
     else
       ''