On channel details, channel name not getting set on ENTER

[jayoshih]

Summary

When you create a new channel and type in a name then press enter, you get an error (vue is waiting on blur event to happen before committing a name)

Category

Select one: BUG

Traceback or relevant snippet from browser console

raven.js:58 TypeError: Cannot set property 'name' of undefined
    at u.e.SET_CHANNEL_NAME (mutations.js:78)
    at vuex.esm.js:697
    at vuex.esm.js:389
    at Array.forEach (<anonymous>)
    at vuex.esm.js:388
    at u._withCommit (vuex.esm.js:495)
    at u.commit (vuex.esm.js:387)
    at u.commit (vuex.esm.js:335)
    at u.a.commit (vuex.esm.js:651)
    at s.n.(/channels/anonymous function) (https://develop.studio.learningequality.org/static/js/bundles/common-3001e197b2a22fff9194.js:7:8269)
    at blur (ChannelEditor.vue?834d:1)
    at Bt (vue.runtime.esm.js:1854)
    at HTMLInputElement.n (vue.runtime.esm.js:2179)
    at HTMLInputElement.Mi.r._wrapper (vue.runtime.esm.js:6911)
    at HTMLInputElement.d (raven.js:445)
    at Object.removeChild (vue.runtime.esm.js:5707)
    at u (vue.runtime.esm.js:5878)
    at n (vue.runtime.esm.js:5867)
    at x (vue.runtime.esm.js:6154)
    at w (vue.runtime.esm.js:6123)
    at vue.runtime.esm.js:6229
    at k (vue.runtime.esm.js:6313)
    at vue.runtime.esm.js:6187
    at k (vue.runtime.esm.js:6313)
    at Sn.__patch__ (vue.runtime.esm.js:6476)
    at Sn.t._update (vue.runtime.esm.js:3942)
    at Sn.mn.before (vue.runtime.esm.js:4060)
    at mn.get (vue.runtime.esm.js:4473)
    at mn.run (vue.runtime.esm.js:4548)
    at fn (vue.runtime.esm.js:4304)
    at Array.<anonymous> (vue.runtime.esm.js:1980)
    at Xt (vue.runtime.esm.js:1906)

How to reproduce

1. Create a new channel
2. Type something into the channel name
3. Press Enter without clicking anywhere else