connecting to cloud database

packages/api/src/controllers/databaseConnections.js

@@ -148,6 +148,9 @@ module.exports = {
     const existing = this.opened.find(x => x.conid == conid && x.database == database);
     if (existing) return existing;
     const connection = await connections.getCore({ conid });
+    if (!connection) {
+      throw new Error(`databaseConnections: Connection with conid="${conid}" not found`);
+    }
     if (connection.passwordMode == 'askPassword' || connection.passwordMode == 'askUser') {
       throw new MissingCredentialsError({ conid, passwordMode: connection.passwordMode });
     }