From da6a37c0d1e9fbe3e80dc6c9236b8be816a3485b Mon Sep 17 00:00:00 2001
From: Shakeeb Sadikeen <shakee.zats@gmail.com>
Date: Wed, 20 Sep 2017 22:14:58 +0530
Subject: [PATCH 1/2] fixed : custom tab with no class error

when class is not passed with custom tab. echo's undefined index error with classes fixed
---
 includes/admin/meta-boxes/views/html-product-data-panel.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/includes/admin/meta-boxes/views/html-product-data-panel.php b/includes/admin/meta-boxes/views/html-product-data-panel.php
index b2fdb00237a..214e29f3b1c 100644
--- a/includes/admin/meta-boxes/views/html-product-data-panel.php
+++ b/includes/admin/meta-boxes/views/html-product-data-panel.php
@@ -32,7 +32,7 @@ if ( ! defined( 'ABSPATH' ) ) {
 
 	<ul class="product_data_tabs wc-tabs">
 		<?php foreach ( self::get_product_data_tabs() as $key => $tab ) : ?>
-			<li class="<?php echo $key; ?>_options <?php echo $key; ?>_tab <?php echo implode( ' ' , (array) $tab['class'] ); ?>">
+			<li class="<?php echo $key; ?>_options <?php echo $key; ?>_tab <?php echo if(isset($tab['class'])) implode( ' ' , (array) $tab['class'] ); ?>">
 				<a href="#<?php echo $tab['target']; ?>"><span><?php echo esc_html( $tab['label'] ); ?></span></a>
 			</li>
 		<?php endforeach; ?>

From 45aaa22bb9b8413b6b0056c6d3c37d95248da903 Mon Sep 17 00:00:00 2001
From: Mike Jolley <mike.jolley@me.com>
Date: Mon, 25 Sep 2017 12:22:17 +0100
Subject: [PATCH 2/2] correct isset

---
 includes/admin/meta-boxes/views/html-product-data-panel.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/includes/admin/meta-boxes/views/html-product-data-panel.php b/includes/admin/meta-boxes/views/html-product-data-panel.php
index 214e29f3b1c..81d0ad94afa 100644
--- a/includes/admin/meta-boxes/views/html-product-data-panel.php
+++ b/includes/admin/meta-boxes/views/html-product-data-panel.php
@@ -32,7 +32,7 @@ if ( ! defined( 'ABSPATH' ) ) {
 
 	<ul class="product_data_tabs wc-tabs">
 		<?php foreach ( self::get_product_data_tabs() as $key => $tab ) : ?>
-			<li class="<?php echo $key; ?>_options <?php echo $key; ?>_tab <?php echo if(isset($tab['class'])) implode( ' ' , (array) $tab['class'] ); ?>">
+			<li class="<?php echo $key; ?>_options <?php echo $key; ?>_tab <?php echo isset( $tab['class'] ) ? implode( ' ' , (array) $tab['class'] ) : ''; ?>">
 				<a href="#<?php echo $tab['target']; ?>"><span><?php echo esc_html( $tab['label'] ); ?></span></a>
 			</li>
 		<?php endforeach; ?>