if no maxFuleUploads defined the dropArea don't have to be hidden

Its either this or you have to make sure it will show up again AFTER
everr file is uploaded.
Also when you upload 8 files and 6 fail, scripts still counts 8 to
determine to hide or show dropArea.
Merge pull request #375 from MikevHoenselaar/master

if no maxFuleUploads defined the dropArea don't have to be hidden