Failing to get charmstore info on upgrade not displaying revision

[ghost]

When upgrading and the charmstore doesn't respond, jujuna will continue upgrading without display the new revision.

Perhaps a couple of retries would be handy?

vagrant@vagrant:~$ jujuna upgrade -o cloud:xenial-ocata -p -a keystone
2019-01-11 21:24:12,504 - jujuna.upgrade - INFO - Applications present in the current model: keystone, percona-cluster
2019-01-11 21:24:12,505 - jujuna.upgrade - INFO - Upgrading charms
2019-01-11 21:24:12,839 - jujuna.upgrade - WARNING - Failed loading information from charmstore: cs:keystone-264
2019-01-11 21:24:12,840 - jujuna.upgrade - INFO - Upgrade keystone from: 264 to: 0
2019-01-11 21:24:50,561 - jujuna.upgrade - INFO - Upgraded: 1 charms