Prevent app crash if team owner removed

app/views/admin/groups/index.html.haml

@@ -26,7 +26,7 @@
     %tr
       %td
         %strong= link_to group.name, [:admin, group]
-      %td= group.description
+      %td= truncate group.description
       %td= group.path
       %td= group.projects.count
       %td

app/views/admin/teams/index.html.haml

@@ -27,12 +27,15 @@
     %tr
       %td
         %strong= link_to team.name, admin_team_path(team)
-      %td= team.description
+      %td= truncate team.description
       %td= team.path
       %td= team.projects.count
       %td= team.members.count
       %td
-        = link_to team.owner.name, admin_user_path(team.owner)
+        - if team.owner
+          = link_to team.owner.name, admin_user_path(team.owner)
+        - else
+          (deleted)
       %td.bgred
         = link_to 'Edit', edit_admin_team_path(team), id: "edit_#{dom_id(team)}", class: "btn btn-small"
         = link_to 'Destroy', admin_team_path(team), confirm: "REMOVE #{team.name}? Are you sure?", method: :delete, class: "btn btn-small btn-remove"