anchor.diff:    </tr>
     <% @reservations[0].each do |reservation| %>
       <tr
  -    data-room-id="<%= reservation.room.id %>"
  -    data-room-name="<%= reservation.room.name %>"
  +    data-room-id="<%= reservation.room.id unless reservation.room.nil? %>"
  +    data-room-name="<%= reservation.room.name unless reservation.room.nil? %>"
       class="reservation"
       >
  -      <td><%= reservation.room.name %></td>
  +      <td><%= reservation.room.name unless reservation.room.nil? %></td>
         <td>
           <%= reservation.formatted_start %> -
           <%= raw reservation.formatted_end %>
  
positive.code:   <% end %>
    <% @reservations[1].each do |reservation| %>
      <tr class="reservation">
        <td><%= reservation.room.name %></td>
        <td>
          <%= reservation.formatted_start %> -
          <%= raw reservation.formatted_end %>
  
negative.code:       <td></td>
      </tr>
    <% end %>
  </table>
  