[#36] MemberAdminWindow: Add MemberList

Elwig/Documents/Document.cs

@@ -84,6 +84,8 @@ namespace Elwig.Documents {
                 name = "DeliveryConfirmation";
             } else if (this is MemberDataSheet) {
                 name = "MemberDataSheet";
+            } else if (this is MemberList) {
+                name = "MemberList";
             } else {
                 throw new InvalidOperationException("Invalid document object");
             }