Handle "No changes" in translation scripts
Handle "No changes" in translation scripts

Some translation proposal jobs currently fail since there are no changes
since the previous run like
https://jenkins.openstack.org/job/django_openstack_auth-propose-translation-update/32/console

Handle the situation to easily figure out real failures.

Change-Id: I1f1dc9b73578ee95e5a964c30313fe0421dbf90a

dongwenjuan/project-config,openstack-infra/project-config,Tesora/tesora-project-config,openstack-infra/project-config,Tesora/tesora-project-config,noorul/os-project-config,noorul/os-project-config,dongwenjuan/project-config