Fixed unauthoriced acsess to group-details

Co-Authored-By: andibuls <andibuls@users.noreply.github.com>
Co-Authored-By: xxnitram <xxnitram@users.noreply.github.com>

src/main/resources/templates/detailsNoMember.html

@@ -62,6 +62,19 @@
                     </div>
                 </div>
             </div>
+            <div class="col-3" style="white-space: nowrap">
+                <div style="display: inline-block; margin: 0">
+                    <h2>Mitglieder</h2>
+                    <div>
+                        <h4>
+                            <a th:text="${group.getMembers().size()}"></a>
+                            <a>von maximal</a>
+                            <a th:text="${group.getUserMaximum()}"></a>
+                            <a>Benutzern.</a>
+                        </h4>
+                    </div>
+                </div>
+            </div>
         </div>
     </div>
 </main>