Completions: notice when no puzzles defined

app/views/contestants/_form.html.slim

@@ -29,6 +29,12 @@
   .row.mt-5
     .col
       h3 Completions
+  - if @contest.puzzles.length == 0
+    .row
+      .col
+        .alert.alert-warning
+          = t("contestants.edit.no_puzzles_note")
+  - else
     .row
       .col
         .alert.alert-info

config/locales/en.yml

@@ -217,6 +217,7 @@ en:
       end_image: End image
       notice: Participant updated
       not_finished: Not yet finished
+      no_puzzles_note: No puzzles were added yet
       offline_participation: Offline participation
       start_image: Start image
       title: Participant

config/locales/fr.yml

@@ -188,6 +188,7 @@ fr:
       end_image: Image de fin
       notice: Participant.e modifié.e
       not_finished: Non terminé
+      no_puzzles_note: Aucun puzzle n'a été défini encore pour ce concours
       offline_participation: Participation hors-ligne
       start_image: Image de début
       title: Participant.e