Fixed configurable product widget issue

Author: gelanivishal

app/code/Magento/Catalog/view/frontend/templates/product/widget/new/column/new_default_list.phtml

@@ -33,7 +33,7 @@
                                 <div class="product-item-actions">
                                     <div class="actions-primary">
                                         <?php if ($_product->isSaleable()): ?>
-                                            <?php if ($_product->getTypeInstance()->hasRequiredOptions($_product)): ?>
+                                            <?php if (!$_item->getTypeInstance()->isPossibleBuyFromList($_item)): ?>
                                                 <button type="button" title="<?= /* @escapeNotVerified */ __('Add to Cart') ?>"
                                                         class="action tocart primary"
                                                         data-mage-init='{"redirectUrl":{"url":"<?= /* @escapeNotVerified */ $block->getAddToCartUrl($_product) ?>"}}'>

app/code/Magento/Catalog/view/frontend/templates/product/widget/new/content/new_grid.phtml

@@ -66,7 +66,7 @@ if ($exist = ($block->getProductCollection() && $block->getProductCollection()->
                                         <?php if ($showCart): ?>
                                             <div class="actions-primary">
                                                 <?php if ($_item->isSaleable()): ?>
-                                                    <?php if ($_item->getTypeInstance()->hasRequiredOptions($_item)): ?>
+                                                    <?php if (!$_item->getTypeInstance()->isPossibleBuyFromList($_item)): ?>
                                                         <button class="action tocart primary"
                                                                 data-mage-init='{"redirectUrl":{"url":"<?= /* @escapeNotVerified */ $block->getAddToCartUrl($_item) ?>"}}'
                                                                 type="button" title="<?= /* @escapeNotVerified */ __('Add to Cart') ?>">

app/code/Magento/Catalog/view/frontend/templates/product/widget/new/content/new_list.phtml

@@ -65,7 +65,7 @@ if ($exist = ($block->getProductCollection() && $block->getProductCollection()->
                                             <?php if ($showCart): ?>
                                                 <div class="actions-primary">
                                                     <?php if ($_item->isSaleable()): ?>
-                                                        <?php if ($_item->getTypeInstance()->hasRequiredOptions($_item)): ?>
+                                                        <?php if (!$_item->getTypeInstance()->isPossibleBuyFromList($_item)): ?>
                                                             <button class="action tocart primary"
                                                                     data-mage-init='{"redirectUrl":{"url":"<?= /* @escapeNotVerified */ $block->getAddToCartUrl($_item) ?>"}}'
                                                                     type="button" title="<?= /* @escapeNotVerified */ __('Add to Cart') ?>">

app/code/Magento/CatalogWidget/view/frontend/templates/product/widget/content/grid.phtml

@@ -61,7 +61,7 @@
                                         <?php if ($showCart): ?>
                                             <div class="actions-primary">
                                                 <?php if ($_item->isSaleable()): ?>
-                                                    <?php if ($_item->getTypeInstance()->hasRequiredOptions($_item)): ?>
+                                                    <?php if (!$_item->getTypeInstance()->isPossibleBuyFromList($_item)): ?>
                                                         <button class="action tocart primary" data-mage-init='{"redirectUrl":{"url":"<?= $block->escapeUrl($block->getAddToCartUrl($_item)) ?>"}}' type="button" title="<?= $block->escapeHtmlAttr(__('Add to Cart')) ?>">
                                                             <span><?= $block->escapeHtml(__('Add to Cart')) ?></span>
                                                         </button>