[BUG] Constraints in Configuration of relationship is NOT working

[minghao (Minghao Pu)]

Description:
During editing content relationship, the constraints are not working.

Reproduce Steps:

1. Find a Custom Type, and click into it
2. Add a content relationship field
3. Add constraint to custom type or add constraint to tags
4. Nothing happens. Meanwhile the following errors in console
   main.js:494 Uncaught TypeError: this.state is not iterable
   at Object.settings#maskbuilder#masks (main.js:494)
   at main.js:305
   at Array.forEach ()
   at HTMLBodyElement.i (main.js:305)
   at HTMLBodyElement. (main.js:305)
   at HTMLBodyElement.dispatch (jquery-2.1.0.min.js:3)
   at HTMLBodyElement.$event.dispatch (drag-tools-2.2x.js:378)
   at HTMLBodyElement.r.handle (jquery-2.1.0.min.js:3)
   (anonymous) @ main.js:494
   (anonymous) @ main.js:305
   i @ main.js:305
   (anonymous) @ main.js:305
   dispatch @ jquery-2.1.0.min.js:3
   $event.dispatch @ drag-tools-2.2x.js:378
   r.handle @ jquery-2.1.0.min.js:3
   main.js:494 Uncaught TypeError: this.state is not iterable
   at onClickOpen (main.js:494)
   at s.default.createElement.onClick (main.js:329)
   at Object.s (main.js:437)
   at p (main.js:437)
   at main.js:437
   at v (main.js:437)
   at at (main.js:437)
   at it (main.js:437)
   at st (main.js:437)
   at pt (main.js:437)
   at j (main.js:437)
   at $ (main.js:437)
   at Zt (main.js:437)
   at Xt (main.js:437)
   at t.unstable_runWithPriority (main.js:445)
   at Gi (main.js:437)
   at D (main.js:437)
   at Kt (main.js:437)