Error when uploading CSV from clipboard

Summary

Error appears while copying csv file to clipboard and pasting it to issue.

OS X 10.11, Chrome 53.0.2785.89

Steps to reproduce

Copy csv file from in finder and paste it in issue window

Expected behavior

Message about wrong file type or something like that

Actual behavior

Stuck on loader, internal error

Relevant logs and/or screenshots

app/uploaders/file_uploader.rb in to_h at line 35:

NoMethodError
undefined method `filename' for nil:NilClass