Issue an error when Nuxeo package to deploy to Connect is not found

When the Nuxeo package to upload is not found (because the regexp to fetch it is not accurate, for instance), the script does not issue any error, which makes it difficult to understand why the package was not deployed.

Seen on https://qa.nuxeo.org/jenkins/job/Deploy/job/IT-nuxeo-master-build/636/consoleText where web-ui package was not referenced correctly:

[WARNING] The requested profile "qa" could not be activated because it does not exist.
Skip packaging step (not a main Nuxeo repository).
Configuration saved: /opt/jenkins/workspace/Deploy/IT-nuxeo-master-build/nuxeo/marketplace/release.ini

==> there is no indication that package was not found

commit https://github.com/nuxeo/integration-scripts/commit/e9ff1a317dafcdbd76accc12f5ba56f9980e02bb fixed the regexp