cubicweb-vcsfile #2150538 crash while patch content is being loaded [resolved]

If you push to a patch repository then switch to the web UI, you can get a "NoneType object has no method getvalue" when the changeset was seen by the system and created in CW, but the content not yet imported.

This looks like a failure, but needs a proper message warning the user that the patch was seen, but its content is not available yet.

done in1.9.3
load left0.000
closed by#04bd9be29b38 Improve error message when the VCS repo is out of sync with cw's db (closes #2150538)