BUG 10746 Doesn't download documents on Home>Documents

I add a valiadation to show a new error message when you are ussing a pluggin to generate the documents and when you are not using pluggins and only the documents weren't genereted or were moved.
Merge pull request #1314 from Jennydmz/BUG-10746

BUG 10746 Doesn't download documents on Home>Documents