1131 fix bug null data in ModuleIndex class

[SilinMykola]

Description (*) Added check for moduleName variable to prevent IllegalArgumentException. Fixed Issues (if relevant)

1. Fixes magento/magento2-phpstorm-plugin#1131

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Contribution checklist (*)

• [ ] Pull request has a meaningful description of its purpose
• [ ] All commits are accompanied by meaningful commit messages
• [ ] All new or changed code is covered with integration/functional tests (if applicable)
• [ ] All automated tests passed successfully (all builds are green)