Fix forceful redirect during document edit in JSF UI

Using
9.3 date-based snapshot (2017-11-17)
FF 56
JSF UI
Dev mode

In Studio
Create a contract doctype with fields:

• url (string with url pattern constraint)
• complexList (complex with required at schema level string and float sub fields)

In Nuxeo Server

• Login as admin
• Edit an existing contract
• Type an invalid value in url field
• Try to submit form twice
• Click on add button for complex field

=> You are redirected to the domain forcefully, see video attached

Expected: user should be able to continue editing the document