Misleading output on stack quasi-resource creation failure

[bittrance]

When there is a failure creating the stack quasi-resource, such as when an imported value is not found, we produce just a misleading "Done." and exit. Example events:

2019-09-23 01:42:19 UTC+0200	bittrance-vpc-swarm DELETE_COMPLETE	-
2019-09-23 01:42:14 UTC+0200	bittrance-vpc-swarm DELETE_IN_PROGRESS	No export named bittrance-vpc-PublicSubnet1 found. Delete requested by user.
2019-09-23 01:42:13 UTC+0200	bittrance-vpc-swarm CREATE_IN_PROGRESS	User Initiated

Reasonably, this should be classified as failure. Thank you CF for not producing an actual CREATE_FAILED 😒