Fix/forgot ref (#5)

* fix: value

* fix: value

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Co-authored-by: raoha.rh <[email protected]>

Author: RaoHai

scripts/test/index.js

@@ -6,6 +6,6 @@ const mysqlVersion = core.getInput('mysql_version').split(',').map(x => x.trim()
 
 core.setOutput('os', JSON.stringify(os));
 core.setOutput('version', JSON.stringify(version));
-core.setOutput('mysql_version', JSON.stringify(mysqlVersion));
+core.setOutput('mysql_version', JSON.stringify(mysqlVersion === '' ? [] : mysqlVersion));
 
 core.info(`os: ${os}, version: ${version}, mysql_version: ${mysqlVersion}`);