[TYPO3-core] RFC #16971: Improve ExtDirect error handling

[Steffen Gebert]

> Bugtracker reference: http://bugs.typo3.org/view.php?id=16971
>
> ExtDirect resonds on timeout with
>   Error parsing json response: null

+1 by reading and testing

I was not able to provoke an error in EM, but for non-reachable servers 
I can see the FlashMessage appearing.

Kind regards
Steffen

-- 
Steffen Gebert
TYPO3 Core Team Member

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