Error message when uploading one or two files in file-browser (BE)
Reproduce in 4.0.1 with:
- Create a "Text w/ images"
- Open the "File browser" in the field "Images:"
- In the file browser popup, enter exactly one or two images in "Upload Image:" (leaving at least one upload-field empty)
- File is uploaded, but error message appears: "No file was uploaded!"
This was not a problem in 4.0.0, but introduced with 4.0.1. It happens in all file-upload forms.
We expect an error just in case no file was uploaded at all.
(issue imported from #M4035)