The logic to control the print of the link was all implemented on the view 
layer. As the link to the parent folder is listed as another row on the files 
list, the conditions for printing the link are: -there are two or more rows on 
the list OR -theres only one row on the list, but it is not a link to the 
parent folder.
With this solution subfolders are considered a content even if they are empty, 
so the case of downloading the zip of a folder full of subfolders but all of 
them empty is still posible.

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https://bugs.launchpad.net/bugs/1298144

Title:
  When the folder is empty, the link to "Download as zip file" should
  not show

Status in Mahara ePortfolio:
  Fix Committed

Bug description:
  Version: master

  The link to "Download folder content as a zip file" should not show if
  the folder is empty

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