Merge forwardport of #11363 to 2.3-develop branch

Applied pull request patch https://github.com/magento/magento2/pull/11363.patch (created by @tim-bezhashvyly) based on commit(s):
  1. 4cdc133

Fixed GitHub Issues in 2.3-develop branch:
  - #6924: Magento 2.1.0 -  "General system exception happened" on Import .csv (reported by @githeat)

Author: magento-engcom-team

app/code/Magento/ImportExport/Model/Import.php

@@ -567,7 +567,6 @@ public function validateSource(\Magento\ImportExport\Model\Import\AbstractSource
                 ProcessingError::ERROR_LEVEL_CRITICAL,
                 null,
                 null,
-                null,
                 $e->getMessage()
             );
         }