anchor.diff:                  <select class="width-80 chosen-select" id="select-team-player" data-placeholder="选择一名队员...">
                     <option value="">请选择一名队员</option>
                     <% @users.each do |user| %>
  -                      <option value="<%= user.id %>"><%= "#{user.user_profile.username} - #{user.nickname}" %></option>
  +                      <option value="<%= user.id %>"><%= "#{user.user_profile.try(:username)} - #{user.nickname}" %></option>
                     <% end %>
   
                   </select>
  
positive.code:                 <select class="width-25 chosen-select" id="select-create-team-leader" data-placeholder="请选择队长">
                    <option value=""></option>
                    <% @users.each do |user| %>
                        <option value="<%= user.id %>"><%= "#{user.user_profile.username} - #{user.nickname}" %></option>
                    <% end %>
                  </select>
                </div>
  
negative.code:                         <% team.team_user_ships.each do |te| %>
                              <div class="profile-activity clearfix" id="<%= "hide-player-#{te.user_id}" %>">
                                <div>
                                  <%= te.user.user_profile.try(:username) %> - <%= te.user.nickname[0..10] %>
                                </div>
  
                                <% if te.user_id == team.user_id %>
                                    <div class="tools action-buttons">
                                      队长
                                      <a href="#update-team-player" role="button" data-toggle="modal" class="blue update-team-player" style="cursor: pointer" title="换人" data-id="<%= team.id %>" data-user-id="<%= te.user_id %>" data-text="<%= te.user.user_profile.try(:username) %>" data-name="<%= team.try(:identifier) %>">
                                        <i class="icon-pencil bigger-125"></i>
                                      </a>
                                    </div>
                                <% else %>
                                    <div class="tools action-buttons">
                                      <a href="#update-team-player" role="button" data-toggle="modal" class="blue update-team-player" style="cursor: pointer" title="换人" data-id="<%= team.id %>" data-user-id="<%= te.user_id %>" data-text="<%= te.user.user_profile.try(:username) %>" data-name="<%= team.try(:identifier) %>">
                                        <i class="icon-pencil bigger-125"></i>
                                      </a>
                                      <a class="red delete-team-player" title="删除队员" style="cursor: pointer" data-id="<%= team.id %>" data-text="<%= te.user.user_profile.try(:username) %>" data-name="<%= te.user_id %>">
                                        <i class="icon-remove bigger-125"></i>
                                      </a>
                                    </div>
  