Patch for bug in auto make manager

[Sascha Cunz]

Hi all,
the attached patch fixes a bug in auto make manager.
Curently it requires the user to enter a name for a new Data-Target. This name 
won't be used. Further there is a "Data in rc" target and the user tries to 
add a "Data in rc" target, it currently appends a 2nd "Data in rc" 
ListViewItem to the details widget. This one can be used, but next time the 
project is loaded both "Data in rc"-Items will be merged into one.

With this patch, there is no more need to enter a name for a new data-target. 
And no ListViewItem will be created, if it already exists.

Cheers
  Sascha
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