Merge pull request #138 from osu-mist/feature/CO-2011-release-db-conn…

…ections-master

CO-2011 Fix bug

src/api/v1/db/oracledb/connection.js

@@ -61,7 +61,7 @@ const validateOracleDb = async () => {
 };
 
 // Close the pool when application is stopped
-process.on('exit', () => { if (pool) pool.close(); });
+process.on('exit', () => { if (pool && pool.close) pool.close(); });
 
 export {
  getConnection, validateOracleDb,