给新建参赛作品中托管项目添加默认选项，使用户自行选择是否需要将参赛作品托管到制定的项目中

app/helpers/contests_helper.rb

@@ -159,6 +159,7 @@ module ContestsHelper
 
   def select_option_helper option
     tmp = Hash.new
+    tmp={"" => ""}
     option.each do |project|
       tmp[project.name] = project.identifier
     end

app/views/softapplications/show.html.erb

@@ -48,7 +48,7 @@
                 </tr>
                 <tr>
                 	<td style="padding-left: 40px">
-                		<% unless @softapplication.deposit_project.nil? %>
+                		<% if (@softapplication.deposit_project != "nil" && @softapplication.deposit_project != "") %>
                 			<%#= textilizable ("托管项目： " + @project.name) %>
                 			托管项目：<%= link_to "#@project", project_path(@project.id) %>                			          
                 		<% end %>