deep model won't work

[AlirezaAlgo]

• I'm submitting a bug

• What is the current behavior?

the app won't work with deep model passing to label or input

• If the current behavior is a bug, please provide the steps to reproduce and if possible a minimal demo of the problem via

this is the version without bug
https://jsfiddle.net/9ody3m2g/

this is a version with the bug

https://jsfiddle.net/1bo0pvad/1/

• What is the expected behavior?
  showing the data from a model in the input

• Please tell us about your environment:

  • Version: 2.3.1
  • Browser: all

[zoul0813]

Fixed in #535