Cannot convert undefined or null to object

[eamodio]

Since the update to Quill 1.1.2 (and specifically this commit)

I'm getting the following error:

TypeError: Cannot convert undefined or null to object
    at Function.keys (<anonymous>)
    at Delta.insert (https://au.fdy.io:5100/jspm_packages/npm/quill@1.1.2/dist/quill.js:2243:54)
    at eval (https://au.fdy.io:5100/jspm_packages/npm/quill@1.1.2/dist/quill.js:3612:26)
    at Array.reduce (native)
    at Delta.reduce (https://au.fdy.io:5100/jspm_packages/npm/quill@1.1.2/dist/quill.js:2317:25)
    at normalizeDelta (https://au.fdy.io:5100/jspm_packages/npm/quill@1.1.2/dist/quill.js:3595:22)
    at Editor.applyDelta (https://au.fdy.io:5100/jspm_packages/npm/quill@1.1.2/dist/quill.js:3345:21)
    at eval (https://au.fdy.io:5100/jspm_packages/npm/quill@1.1.2/dist/quill.js:1959:44)
    at Quill.modify (https://au.fdy.io:5100/jspm_packages/npm/quill@1.1.2/dist/quill.js:2089:22)
    at Quill.setContents (https://au.fdy.io:5100/jspm_packages/npm/quill@1.1.2/dist/quill.js:1955:27)
    at RichEditable.setValue (https://au.fdy.io:5100/dist/components/editable/rich-editable.js:34:33)
    at RichEditable.attached (https://au.fdy.io:5100/dist/components/editable/editable-base.js:47:26)
    at Controller.attached (https://au.fdy.io:5100/jspm_packages/npm/aurelia-templating@1.1.2/aurelia-templating.js:3472:24)
    at View.attached (https://au.fdy.io:5100/jspm_packages/npm/aurelia-templating@1.1.2/aurelia-templating.js:1563:24)
    at ViewSlot.add (https://au.fdy.io:5100/jspm_packages/npm/aurelia-templating@1.1.2/aurelia-templating.js:1726:14)
    at eval (https://au.fdy.io:5100/jspm_packages/npm/aurelia-templating@1.1.2/aurelia-templating.js:4417:28)

It is because sometimes from our server the attributes on an insert object exists but is null or undefined.

It looks like a null/undefined check needs to be added here:
https://github.com/quilljs/delta/blob/master/lib/delta.js#L26
and here:
https://github.com/quilljs/delta/blob/master/lib/delta.js#L38