zip import bug

dear developers

(silva-1.1.1-all)

i tried to import a zip file with eleven images and without 
subdirectory. with the default setting in silva, the recreation of 
subdirectories enabled, i get the following error:

Finished importing: could not add: «», «», «», «», «», «», «», «», «», 
«» and «»

when the recreation of subdirectories is not enabled the zip import 
works flawlessly. needless to say, that the default should work even 
when there are no subdirectories.

regards,
marc