Graph/stats page

[ochorocho]

Check this issue:

Started GET "/whitewall_graph" for 5.158.158.170 at 2018-04-23 14:57:56 +0200
Processing by GraphController#index as HTML
  Current user: j.roth (id=982)
  Rendered plugins/whitewall/app/views/graph/index.html.erb within layouts/base (57.5ms)
Completed 500 Internal Server Error in 90ms (ActiveRecord: 11.6ms)

ActionView::Template::Error (undefined method `<' for nil:NilClass):
    76: 											<span><%= l(:label_issue_count) %>:</span> <%= user_week_issue(user,week[0],week[1]).count %>
    77: 										</div>
    78: 										<div class="delayed">
    79: 											<span><%= l(:label_issue_delayed) %>:</span> <%= user_week_issues_delayed(user,week[0],week[1]).count %>
    80: 										</div>
    81: 									</div>
    82: 									<div class="weeklyGraph" data-progress-value="<%= user_week_estimated_hours(user,week[0],week[1]) %>" data-progress-max="<%= @settings = Setting.plugin_whitewall["whitewall_limit"] %>"></div>
  plugins/whitewall/app/helpers/issueweek_helper.rb:35:in `block in user_week_issues_delayed'
  plugins/whitewall/app/helpers/issueweek_helper.rb:33:in `user_week_issues_delayed'
  plugins/whitewall/app/views/graph/index.html.erb:79:in `block (2 levels) in _plugins_whitewall_app_views_graph_index_html_erb___221631080_919068340'
  plugins/whitewall/app/views/graph/index.html.erb:68:in `each'
  plugins/whitewall/app/views/graph/index.html.erb:68:in `block in _plugins_whitewall_app_views_graph_index_html_erb___221631080_919068340'
  plugins/whitewall/app/views/graph/index.html.erb:64:in `_plugins_whitewall_app_views_graph_index_html_erb___221631080_919068340'
  plugins/troi/lib/patches/application_controller_patch.rb:32:in `set_api_credentials'
  lib/redmine/sudo_mode.rb:63:in `sudo_mode'