MAGETWO-95637: Validate file extension before upload

Author: viktorpetryk

app/code/Magento/CatalogImportExport/Model/Import/Uploader.php

@@ -167,7 +167,7 @@ public function move($fileName, $renameFileOff = false)
             $filePath = $this->getTmpDir() . '/';
         } else {
             $filePath = '';
- 		}
+        }
 
         if (preg_match('/\bhttps?:\/\//i', $fileName, $matches)) {
             $url = str_replace($matches[0], '', $fileName);