1215: fix parsing of plugin sort order value [backport 5.0.1]

Author: VitaliyBoyko

CHANGELOG.md

@@ -11,6 +11,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0).
 - Throwable: Stub index points to a file without PSI [#1232](https://github.com/magento/magento2-phpstorm-plugin/pull/1232)
 - Create an entity - delete button is displayed in a new entity form [#1268](https://github.com/magento/magento2-phpstorm-plugin/pull/1268)
 - Covered possible NullPointerException in InjectAViewModelDialog.java [#1213](https://github.com/magento/magento2-phpstorm-plugin/pull/1213)
+- MapReduceIndexMappingException: java.lang.NumberFormatException: For input string: "" [#1235](https://github.com/magento/magento2-phpstorm-plugin/pull/1235)
 
 ## 5.0.0