MAGETWO-83706: Scheduled Update to existing Group Price / Special Price removes the previously configured price, or results in changes not being saved

Author: le0n4eg

app/code/Magento/Catalog/Model/Product/Attribute/Backend/TierPrice/SaveHandler.php

@@ -80,7 +80,7 @@ public function execute($entity, $arguments = [])
         $priceRows = $entity->getData($attribute->getName());
         if (null !== $priceRows) {
             if (!is_array($priceRows)) {
-                throw new \Magento\Framework\Exception\RuntimeException(
+                throw new \Magento\Framework\Exception\InputException(
                     __('Tier prices data should be array, but actually other type is received')
                 );
             }

app/code/Magento/Catalog/Model/Product/Attribute/Backend/TierPrice/UpdateHandler.php

@@ -77,7 +77,7 @@ public function execute($entity, $arguments = [])
         $priceRows = $entity->getData($attribute->getName());
         if (null !== $priceRows) {
             if (!is_array($priceRows)) {
-                throw new \Magento\Framework\Exception\RuntimeException(
+                throw new \Magento\Framework\Exception\InputException(
                     __('Tier prices data should be array, but actually other type is received')
                 );
             }

app/code/Magento/Catalog/Test/Unit/Model/Attribute/Backend/TierPrice/SaveHandlerTest.php

@@ -151,7 +151,7 @@ public function testExecute()
     }
 
     /**
-     * @expectedException \Magento\Framework\Exception\RuntimeException
+     * @expectedException \Magento\Framework\Exception\InputException
      * @expectedExceptionMessage Tier prices data should be array, but actually other type is received
      */
     public function testExecuteWithException()

app/code/Magento/Catalog/Test/Unit/Model/Attribute/Backend/TierPrice/UpdateHandlerTest.php

@@ -160,7 +160,7 @@ public function testExecute()
     }
 
     /**
-     * @expectedException \Magento\Framework\Exception\RuntimeException
+     * @expectedException \Magento\Framework\Exception\InputException
      * @expectedExceptionMessage Tier prices data should be array, but actually other type is received
      */
     public function testExecuteWithException()