fixed validation for bundle checkbox options

Author: ProkopovVitaliy

app/code/Magento/Bundle/view/frontend/templates/catalog/product/view/type/bundle/option/checkbox.phtml

@@ -32,7 +32,8 @@
                                data-selector="bundle_option[<?= $block->escapeHtmlAttr($_option->getId()) ?>][<?= $block->escapeHtmlAttr($_selection->getId()) ?>]"
                                <?php if ($block->isSelected($_selection)) { echo ' checked="checked"'; } ?>
                                <?php if (!$_selection->isSaleable()) { echo ' disabled="disabled"'; } ?>
-                               value="<?= $block->escapeHtmlAttr($_selection->getSelectionId()) ?>"/>
+                               value="<?= $block->escapeHtmlAttr($_selection->getSelectionId()) ?>"
+                               data-errors-message-box="#validation-message-box"/>
                         <label class="label"
                                for="bundle-option-<?= $block->escapeHtmlAttr($_option->getId()) ?>-<?= $block->escapeHtmlAttr($_selection->getSelectionId()) ?>">
                             <span><?= /* @noEscape */ $block->getSelectionQtyTitlePrice($_selection) ?></span>
@@ -42,6 +43,7 @@
                     </div>
                 <?php endforeach; ?>
                 <div id="bundle-option-<?= $block->escapeHtmlAttr($_option->getId()) ?>-container"></div>
+                <div id="validation-message-box"></div>
             <?php endif; ?>
         </div>
     </div>