Don't fall when just loading heatv1 modules

this avoids loading warnings on salt-master that may not have
os-client-config installed, as salt tries to load them irrespective of
__virtual__() result.

Change-Id: I56871fec52e656d764e95ca2e93f10fe97d6a3c6
Related-Issue: https://mirantis.jira.com/browse/PROD-26920
1 file changed