Show missing speakers in reports

app/views/admin/events/reports.html.haml

@@ -13,6 +13,12 @@
         %span.label.label-success{style: 'border-radius: 1em;'}
           = @events_with_requirements.length
 
+    %li
+      %a{href: '#missing-speakers', 'data-toggle' => 'tab'}
+        Missing Speakers
+        %span.label.label-danger{style: 'border-radius: 1em;'}
+          = @missing_event_speakers.length
+
   .tab-content
     #all.tab-pane.active
       .row
@@ -94,3 +100,28 @@
                 %td= link_to event.title, edit_conference_program_proposal_path(@conference.short_title, event)
                 %td  #{event.speaker_names}
                 %td= event.description
+
+    #missing-speakers.tab-pane
+      .row
+        .col-md-12
+          .page-header
+            %h1
+              Missing Speakers
+              = "(#{@missing_event_speakers.length})"
+            %p.text-muted
+              All event speakers who haven't checked in
+      .col-md-12
+        %table.table.table-striped.table-bordered.table-hover.datatable
+          %thead
+            %th Speaker Name
+            %th Registered?
+            %th Event
+            %th Start Time
+          %tbody
+            - @missing_event_speakers.each do |speaker|
+              %tr
+                %td= speaker.user.name
+                %td= @conference.user_registered?(speaker.user) ? 'Yes' : 'No'
+                %td= link_to speaker.event.title, edit_conference_program_proposal_path(@conference.short_title, speaker.event)
+                - event_start_time = speaker.event.time
+                %td= event_start_time.present? ? event_start_time : '-'