Fixed milestone dropdown tests

app/helpers/milestones_helper.rb

@@ -55,6 +55,12 @@ module MilestonesHelper
     end
   end
 
+  def milestone_dropdown_selected_text
+    project = @target_project || @project || @projects
+
+    Milestone.of_projects(project).where(title: params[:milestone_title]).first().try(:name)
+  end
+
   def milestone_remaining_days(milestone)
     if milestone.expired?
       content_tag(:strong, 'Past due')

app/views/shared/issuable/_milestone_dropdown.html.haml

-- project = @target_project || @project
+- project = @target_project || @project || @projects
 - extra_class = extra_class || ''
-- selected_text = project.milestones.find_by_id(selected).try(:name)
+- selected_text = milestone_dropdown_selected_text
 - if selected.present?
   = hidden_field_tag(name, selected)
 = dropdown_tag(milestone_dropdown_label(selected_text), options: { title: "Filter by milestone", toggle_class: "js-milestone-select js-filter-submit #{extra_class}", filter: true, dropdown_class: "dropdown-menu-selectable",
   placeholder: "Search milestones", footer_content: project.present?, data: { show_no: true, show_any: show_any, show_upcoming: show_upcoming, field_name: name, selected: selected, project_id: project.try(:id), milestones: milestones_filter_dropdown_path, default_label: "Milestone" } }) do
-  - if project
+  - if project && project.respond_to?(:namespace)
     %ul.dropdown-footer-list
       - if can? current_user, :admin_milestone, project
         %li