Silenced error while downloading pretrained model

[festeh]

🐛 Bug

Currently, if user failed to download a model, they will receive uninformative and confusing message (see #5787). This is most hurting for users behind a proxy. This happens because of this line. My opinion is that there should be at least a warning, and if force_download is True, then error should be raised. I can make a PR if you agree with that.

[julien-c]

This sounds reasonable

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.