If a project has 0 documents, the "Download all for offline translation" option should not be enabled. It provides basically an empty zip - albeit with the zanata.xml, which is in the menu above anyhow.
1. Create a project, and version
2. Select a language
3. Pull down the menu for the documents pane for that language
Option is enabled, despite having zero value
Still an issue in 4.0
We are closing all the old issues to have more clarity in our backlog for Zanata project. Feel free to re-open or leave a comment if you require our attention on your Jira.