Error in console logs: Cannot read property 'idref' when epub is opened in reader

[hotTea]

This issue is a Bug

Expected Behavior

There should be no errors in browser's console of the type "cannot read property 'idref'"
I don't know what the impact of the error is, but it wasn't present in readium's older build.

Observed behavior

There are multiple errors of the type below
Uncaught TypeError: Cannot read property 'idref' of undefined external_agent_support.js:155
ExternalAgentSupport.updateContentDocument (external_agent_support.js:155)
reader_view.js:284

Steps to reproduce

1. Get the latest code from readium repository
2. checkout develop branch
3. Run the command "npm run prepare:all" as needed
4. Run "npm run http"
5. Open sample epub - http://127.0.0.1:8080/dev/index_RequireJS_no-optimize.html?epub=..%2Fepub_content%2Fmoby_dick
6. Open web browser's console and observe the errors mentioned above.

Product

• Readium cloud reader app
  • Issue can also be seen at https://readium.firebaseapp.com/?epub=epub_content%2Fpage-blanche
  • Browser and version
    • Chrome Version 61.0.3163.100

[danielweck]

@jccr what do you think?

[danielweck]

https://github.com/readium/readium-shared-js/blob/b73ba7a4912de68a9953f11e17b45e1c857b6c2c/js/views/external_agent_support.js#L155

var contentDocument = contentDocuments[spineItem.idref];

[danielweck]

Duplicate of:
readium/readium-shared-js#407

Note that we are prioritizing the bugfix, there is a Pull Request that removes the console error:
readium/readium-shared-js#409

[hotTea]

Thanks for the quick turnaround !