Redmine

As some code paths assume the these aren't blank there is backtraces.

Environment:
Redmine version 2.6.1.stable
Ruby version 1.9.3-p194 (2012-04-20) [i486-linux]
Rails version 3.2.21
Environment production
Database adapter PostgreSQL
SCM:
Git 1.7.10.4
Filesystem
Redmine plugins:
no plugin installed

db:migration was successful.

Started GET "/issues/1527" for 59.167.242.100 at 2015-02-05 23:57:19 -0500
Processing by IssuesController#show as HTML
  Parameters: {"id"=>"1527"}
  Current user: danblack (id=1)
  Rendered issues/_action_menu.html.erb (4.4ms)
  Rendered issues/show.html.erb within layouts/base (4.8ms)
Completed 500 Internal Server Error in 85.7ms

ActionView::Template::Error (undefined method `-' for nil:NilClass):
    3: <%= link_to l(:button_log_time), new_issue_time_entry_path(@issue), :class => 'icon icon-time-add' if User.current.allowed_to?(:log_time, @project) %>
    4: <%= watcher_link(@issue, User.current) %>
    5: <%= link_to l(:button_copy), project_copy_issue_path(@project, @issue), :class => 'icon icon-copy' if User.current.allowed_to?(:add_issues, @project) %>
    6: <%= link_to l(:button_delete), issue_path(@issue), :data => {:confirm => issues_destroy_confirmation_message(@issue)}, :method => :delete, :class => 'icon icon-del' if User.current.allowed_to?(:delete_issues, @project) %>
    7: </div>
  app/helpers/issues_helper.rb:186:in `block in issues_destroy_confirmation_message'
  app/helpers/issues_helper.rb:186:in `each'
  app/helpers/issues_helper.rb:186:in `inject'
  app/helpers/issues_helper.rb:186:in `issues_destroy_confirmation_message'
  app/views/issues/_action_menu.html.erb:6:in `_app_views_issues__action_menu_html_erb___32050337_88082350'
  app/views/issues/show.html.erb:1:in `_app_views_issues_show_html_erb__401709787_88338760'
  app/controllers/issues_controller.rb:128:in `block (2 levels) in show'
  app/controllers/issues_controller.rb:125:in `show'

Started GET "/projects/ace-hosting/issues" for 59.167.242.100 at 2015-02-06 00:09:43 -0500
Processing by IssuesController#index as HTML
  Parameters: {"project_id"=>"ace-hosting"}
  Current user: danblack (id=1)
  Rendered queries/_filters.html.erb (17.0ms)
  Rendered queries/_columns.html.erb (2.0ms)
  Rendered issues/_list.html.erb (13.7ms)
  Rendered issues/index.html.erb within layouts/base (36.5ms)
Completed 500 Internal Server Error in 133.7ms

ActionView::Template::Error (undefined method `<' for nil:NilClass):
    15:     </tr>
    16:   </thead>
    17:   <% previous_group = false %>
    18:   <tbody>
    19:   <% issue_list(issues) do |issue, level| -%>
    20:   <% if @query.grouped? && (group = @query.group_by_column.value(issue)) != previous_group %>
    21:     <% reset_cycle %>
  lib/plugins/awesome_nested_set/lib/awesome_nested_set/model/relatable.rb:114:in `within_node?'
  lib/plugins/awesome_nested_set/lib/awesome_nested_set/model/relatable.rb:54:in `is_descendant_of?'
  app/helpers/issues_helper.rb:26:in `block in issue_list'
  app/helpers/issues_helper.rb:25:in `each'
  app/helpers/issues_helper.rb:25:in `issue_list'
  app/views/issues/_list.html.erb:18:in `block in _app_views_issues__list_html_erb___498719239_107193180'
  app/views/issues/_list.html.erb:1:in `_app_views_issues__list_html_erb___498719239_107193180'
  app/views/issues/index.html.erb:63:in `_app_views_issues_index_html_erb__714360211_108178980'
  app/controllers/issues_controller.rb:87:in `block (2 levels) in index'
  app/controllers/issues_controller.rb:86:in `index'