Added the ability to unassign issues with bulk edit.

git-svn-id: http://redmine.rubyforge.org/svn/trunk@850 e93f8b46-1217-0410-a6f0-8f06a7374b81

app/controllers/projects_controller.rb

@@ -350,7 +350,7 @@ class ProjectsController < ApplicationController
       issues.each do |issue|
         journal = issue.init_journal(User.current, params[:notes])
         issue.priority = priority if priority
-        issue.assigned_to = assigned_to if assigned_to
+        issue.assigned_to = assigned_to if assigned_to || params[:assigned_to_id] == 'none'
         issue.category = category if category
         issue.fixed_version = fixed_version if fixed_version
         issue.start_date = params[:start_date] unless params[:start_date].blank?

app/views/issues/_bulk_edit_form.rhtml

@@ -13,7 +13,9 @@
 </p>
 <p>
 <label><%= l(:field_assigned_to) %>: 
-<%= select_tag('assigned_to_id', "<option value=\"\">#{l(:label_no_change_option)}</option>" + options_from_collection_for_select(@project.assignable_users, :id, :name)) %></label>
+<%= select_tag('assigned_to_id', content_tag('option', l(:label_no_change_option)) +
+                                 content_tag('option', l(:label_nobody), :value => 'none') +
+                                 options_from_collection_for_select(@project.assignable_users, :id, :name)) %></label>
 <label><%= l(:field_fixed_version) %>: 
 <%= select_tag('fixed_version_id', "<option value=\"\">#{l(:label_no_change_option)}</option>" + options_from_collection_for_select(@project.versions, :id, :name)) %></label>
 </p>