Share modal doesn't work on admin page

[jayoshih]

Summary

Category

Select one: BUG

Usage Details

Please give details about how you were using Studio.

• Browser: ?
• Channel: ?
• Topic/Content Item: ?

Traceback or relevant snippet from browser console

Uncaught TypeError: Cannot read property 'toJSON' of undefined
    at i.render (views.js:125)
    at initialize (views.js:103)
    at i.e.View (backbone.js:1224)
    at i [as constructor] (backbone.js:1884)
    at new i (backbone.js:1884)
    at initialize (views.js:70)
    at i.e.View (backbone.js:1224)
    at i [as constructor] (backbone.js:1884)
    at i [as constructor] (backbone.js:1884)
    at new i (backbone.js:1884)
    at i.open_sharing (views.js:403)
    at j (underscore.js:762)
    at HTMLButtonElement.<anonymous> (underscore.js:775)
    at HTMLButtonElement.<anonymous> (underscore.js:122)
    at HTMLDivElement.dispatch (jquery.js:4737)
    at HTMLDivElement.v.handle (jquery.js:4549)
    at HTMLDivElement.d (raven.js:445)

How to reproduce

1. Log in as admin
2. Try to open share modal on one of the channels

Real-life consequences (anything community should be aware of, for instance how it affects end users)

It may be trickier for admins to manage channels