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Bugtracker #28333: JFTP call "DL" function that sometimes is removed by hosting environment and cause fatal error without message 

The fix is present in Joomla 2.5 and not present in 3.1

The reason of the issue is due to the fact that the "dl" function is called event when FTP layer is not used.
As soon as a jimport load the FTP client somewhere it cause a fatal error that is hide due to the "@dl" that does not report error.

The fix consists in checking that function "dl" exists before calling it.

To reproduce it, you need to setup a server that does not contain the FTP module and that does not include the "dl" function.
Becarefull that most WAMP or similar include the FTP and dl in the core that can not be removed.
 # [#31108] Fatal erorr right after install. Thanks Klas and Michael
Babker
(Fix #1245)
 # [#31120] [2.5] *plug-in manager search give errors and warning for
'/','*' and '\
# [#30354] Invalid Javascript Redirect in JApplication::redirect() when
headers have already been sent. Thanks Ben Tasker.
(Fix #868)
 $ [#26548] [patch] incorrect error check in menus.php. Thanks Rob
Clayburn and Ben Tasker
(Fix #1011)