[TYPO3-core] RFC: fix for bug #3097 (EM leaves mirror* files on failure)

[Dmitry Dulepov]

+1. Please, update message as suggested in the bug if possible.

Karsten Dambekalns wrote:
> BT ref: http://bugs.typo3.org/view.php?id=3097
> 
> Problem: If EM fails to load a list of mirror, it leaves mirror* file in the 
> typo3temp. Thus after 10 displays of "Settings" page there will be 10 empty 
> mirror* files.
> 
> Solution: Remove the file created by tempnam if the download fails.
> 
> The patch adds clearer error message, too.

Dmitry.
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