Add empty option for ITU zone in QSO edit

application/views/qso/edit_ajax.php

@@ -286,6 +286,7 @@
                                 <div class="mb-3">
                                     <label for="itu"><?= __("ITU Zone"); ?></label>
                                     <select class="form-select" id="itu" name="itu" required>
+                                        <option value=''></option>
                                         <?php
                                         for ($i = 1; $i<=90; $i++) {
                                             echo '<option value='. $i;