feature/MYFACES-4466: the last ajax integration test fails

The test is derived from my internal protocol tests, which all pass on this codebase.

However it might test functionality not in the spec but in the original implementation.

There have been minor changes on how error reporting is handled, given we have newer browsers now

(ie errors are now logged not alerted anymore for instance)

As far as I can see the test tests for a client error condition. I will need to investigate this next week. 

Given I have tests on error conditions in my newer integration tests as well, the test might be even outdated!

It is not critical and very likely just a test issue itself, because the TCKs pass and my newer integration tests as well!

But I want this covered so that I can pick up a small investigation sometime next week!