Default type to object if undefined

[domharrington]

Reasons for making this change

Fixes #1265

Added tests and confirmed working on the local test app:
http://localhost:8080/#eyJmb3JtRGF0YSI6e30sInNjaGVtYSI6eyJwcm9wZXJ0aWVzIjp7ImEiOnsidHlwZSI6InN0cmluZyJ9fX0sInVpU2NoZW1hIjp7fX0=

Checklist

• I'm updating documentation
  • I've checked the rendering of the Markdown text I've added
• I'm adding or updating code
  • I've added and/or updated tests
  • I've updated docs if needed
  • I've run npm run cs-format on my branch to conform my code to prettier coding style
• I'm adding a new feature
  • I've updated the playground with an example use of the feature

[epicfaace]

Thanks!