Adds a 'Add subprojects' permission.

* 'Add project' permission will let user create a root project
* 'Add subprojects' permission will let project members create subprojects

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@3238 e93f8b46-1217-0410-a6f0-8f06a7374b81

app/views/projects/_form.rhtml

@@ -4,7 +4,7 @@
 <!--[form:project]-->
 <p><%= f.text_field :name, :required => true %><br /><em><%= l(:text_caracters_maximum, 30) %></em></p>
 
-<% unless @project.allowed_parents.empty? %>
+<% unless @project.allowed_parents.compact.empty? %>
     <p><label><%= l(:field_parent) %></label><%= parent_project_select_tag(@project) %></p>
 <% end %>