style: Enhance team member photo handling and ensure fallback members are displayed when no team members are available

Website/templates/team.html

@@ -9,7 +9,8 @@
 </section>
 
 <section class="team-grid" aria-label="Team Cards">
-    {% for member in team_members %}
+    {% if team_members and team_members|length > 0 %}
+        {% for member in team_members %}
         <article class="member-card">
             {% if member and member.photo %}
                 <img class="member-photo" src="{{ url_for('static', filename=member.photo) }}" alt="Teamfoto {{ member.name }}">
@@ -25,7 +26,11 @@
                 {% endif %}
             </div>
         </article>
-    {% endfor %}
+</section>
+
+{% if not team_members or team_members|length == 0 %}
+    <p>Derzeit sind keine Teammitglieder eingetragen. Bitte füge im Adminbereich Team-Einträge in der Datenbank hinzu.</p>
+{% endif %}
 </section>
 
 <section class="values">