ID 569213 - Display error when downloaded file has 0 bytes

Problem summary
Flix displays an incorrect message when it downloads a 0-byte file.

Customer reported version
flix_6.6.2

Customer reported platform
windows10

Steps to reproduce

1) Create a sequence revision in Flix with missing original artwork (you might need to manually replace original artwork files with 0-byte files in the asset directory)

2) Export original artwork for the assets with 0-byte files
 

Expected behaviour
Flix downloads original artwork but it is 0 bytes.

Flix displays a warning banner that some of the files downloaded were 0-byte. It needs to be clear that the issue is not on the export/download process, as Flix is just outputting what it has.

Message should prompt to check the Client logs to see exactly which panels have 0byte artwork; logs should list panel IDs and not asset/media object IDs.

Actual behaviour
Flix downloads original artwork with 0-byte filesize without displaying any errors or warnings.

Workaround
Check the filesize of downloaded panels if exporting panels. This issue can happen during publishing 

Reproduced by support
Flix 6.6.2