开始日期、计划完成日期不合法已发异常判断修改

app/helpers/watchers_helper.rb

@@ -211,6 +211,9 @@ module WatchersHelper
   end
 
   def watchers_checkboxes(object, users, checked=nil)
+    if users.nil?
+
+    else
       users.map do |user|
         c = checked.nil? ? object.watched_by?(user) : checked
         tag = check_box_tag 'issue[watcher_user_ids][]', user.id, c, :id => nil
@@ -219,6 +222,7 @@ module WatchersHelper
                     :class => "floating"
       end.join.html_safe
     end
+  end
 
   def applied_css(project)
     id = project.id