Fix date display in media details and statistics templates to handle missing dates gracefully

Author: FuzzyGrim

src/templates/app/media_details.html

@@ -789,7 +789,7 @@ <h2 class="text-xl font-semibold mb-1 line-clamp-1">{{ episode.title }}</h2>
                   </div>
                   {% if episode.history %}
                     <p class="text-xs text-gray-400 mt-2 px-4">
-                      Last watched: {{ episode.history.0.end_date|date_tracker_format }}
+                      Last watched: {{ episode.history.0.end_date|date_tracker_format|default_if_none:"No date provided" }}
                       {% if episode.history|length > 1 %}• Watched {{ episode.history|length }} times{% endif %}
                     </p>
                   {% endif %}

src/templates/app/statistics.html

@@ -573,9 +573,9 @@ <h4 class="font-medium">
                           </h4>
                           <div class="text-sm text-gray-400 mt-1">
                             <p>
-                              {{ media.start_date|date_tracker_format }}
+                              {% if media.start_date %}{{ media.start_date|date_tracker_format }}{% endif %}
                               {% if media.start_date and media.end_date %}-{% endif %}
-                              {{ media.end_date|date_tracker_format }}
+                              {% if media.end_date %}{{ media.end_date|date_tracker_format }}{% endif %}
                             </p>
                           </div>
                           {% if media.score is not None %}