Cannot create a kv-memory datasource using lb4 datasource

[bajtos]

Description / Steps to reproduce / Feature proposal

Create an LB4 app, e.g. via lb4 app.

Try to create a datasource backed by kv-memory connector by running lb4 datasource.

Current Behavior

The process crashes.

$ lb4 datasource
? Datasource name: keyvalue
? Select the connector for keyvalue: In-memory key-value connector (supported by StrongLoop)
events.js:167
      throw er; // Unhandled 'error' event
      ^

TypeError: Cannot convert undefined or null to object
    at Function.entries (<anonymous>)
    at DataSourceGenerator.promptConnectorConfig (/Users/bajtos/src/loopback/next/packages/cli/generators/datasource/index.js:159:12)
    at Object.<anonymous> (/Users/bajtos/src/loopback/next/packages/cli/node_modules/yeoman-generator/lib/index.js:424:27)
    at /Users/bajtos/src/loopback/next/packages/cli/node_modules/run-async/index.js:25:25
    at new Promise (<anonymous>)
    at /Users/bajtos/src/loopback/next/packages/cli/node_modules/run-async/index.js:24:19
    at self.env.runLoop.add.completed (/Users/bajtos/src/loopback/next/packages/cli/node_modules/yeoman-generator/lib/index.js:425:13)
    at runCallback (timers.js:694:18)
    at tryOnImmediate (timers.js:665:5)
    at processImmediate (timers.js:647:5)
Emitted 'error' event at:
    at Immediate.setImmediate (/Users/bajtos/src/loopback/next/packages/cli/node_modules/yeoman-generator/lib/index.js:433:22)
    at runCallback (timers.js:694:18)
    at tryOnImmediate (timers.js:665:5)
    at processImmediate (timers.js:647:5)

Expected Behavior

The datasource is created.

See Reporting Issues for more tips on writing good issues

[bajtos]

When I select the kv-redis connector, everything works as expected.