Fix crash on project page

Created by: moskvin

Started GET "/spotty-ohg/spotty-android" for 127.0.0.1 at 2013-04-03 15:57:22 +0200 Processing by ProjectsController#show as HTML Parameters: {"id"=>"spotty-ohg/spotty-android"} Rendered shared/_clone_panel.html.haml (0.5ms) Rendered projects/_clone_panel.html.haml (20.9ms) Rendered projects/show.html.haml within layouts/project_resource (21.2ms) Completed 500 Internal Server Error in 73ms

ActionView::Template::Error (undefined method gsub' for nil:NilClass): 13: = link_to new_project_merge_request_path(@project), title: "New Merge Request", class: "btn-small btn grouped" do 14: Merge Request 15: - if @project.issues_enabled && can?(current_user, :write_issue, @project) 16: = link_to url_for_new_issue, title: "New Issue", class: "btn-small btn grouped" do 17: Issue app/helpers/issues_helper.rb:64:inurl_for_new_issue' app/views/projects/_clone_panel.html.haml:16:in _app_views_projects__clone_panel_html_haml___3342724398662049053_57374700' app/views/projects/show.html.haml:1:in_app_views_projects_show_html_haml___910950264290853202_35240260' app/controllers/projects_controller.rb:64:in block (2 levels) in show' app/controllers/projects_controller.rb:58:inshow'