empty file upload

Expected Behavior

Current Behavior

Steps to Reproduce

  1. do not chose or drop a file
  2. click on button "save datafile"
  3. a new/empty datafile object is created

Additional Information (optional)

Possible Solution

maybe, grey out button when no file is selected; and, of course, let the model check for empty/non-files

Context

Detailed Description

Possible Implementation