Add playlist field to MusikGame model and update YouTube credentials handling in views

game/templates/game/home.html

@@ -2,7 +2,7 @@
 <h2>Mes groupes</h2>
 <p>
     <a href="{% url "group_create" %}" role="button"><i class="ri-add-box-fill"></i> Créer un groupe</a>
-    {% if not user.youtubecredentials %}
+    {% if not user.youtubecredentials.credentials %}
         <a href="{% url "youtube_login" %}" role="button"><i class="ri-youtube-fill"></i> Me connecter au compte Youtube</a>
     {% endif %}
 </p>

game/templates/game/musikgame_detail.html

@@ -3,6 +3,13 @@
     <h1>
         <i class="ri-play-circle-fill"></i> {{ musikgame.date }}
     </h1>
+    {% if musikgame.playlist %}
+        <p>
+            <a target="_blank"
+               href="https://youtube.com/playlist?list={{ musikgame.playlist }}"
+               role="button"><i class="ri-youtube-fill"></i> Playlist</a>
+        </p>
+    {% endif %}
     <h2>
         <i class="ri-group-2-fill"></i> Joueurs
     </h2>