no message

app/code/Magepow/Sizechart/Block/Product/Sizechart.php

@@ -134,6 +134,6 @@ class Sizechart extends \Magento\Catalog\Block\Product\AbstractProduct
             $chartTable      = $sizeChart->getData('custom_size');
             $chartTableArray = $chartTable;
         }
-        return json_encode([], true);
+        return json_encode($chartTableArray, true);
     }
 }
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