Unable to remove IG with LauchTemplate

[pkutishch]

1. What kops version are you running? The command kops version, will display
this information.
Version 1.12.0-beta.2 (git-d1453d22a)

2. What Kubernetes version are you running? kubectl version will print the
version if a cluster is running or provide the Kubernetes version specified as
a kops flag.
Client Version: version.Info{Major:"1", Minor:"10", GitVersion:"v1.10.5", GitCommit:"32ac1c9073b132b8ba18aa830f46b77dcceb0723", GitTreeState:"clean", BuildDate:"2018-06-21T11:46:00Z", GoVersion:"go1.9.3", Compiler:"gc", Platform:"darwin/amd64"}
Server Version: version.Info{Major:"1", Minor:"10", GitVersion:"v1.10.11", GitCommit:"637c7e288581ee40ab4ca210618a89a555b6e7e9", GitTreeState:"clean", BuildDate:"2018-11-26T14:25:46Z", GoVersion:"go1.9.3", Compiler:"gc", Platform:"linux/amd64"}

**3. AWS

**4. kops delete ig test

**5.
Deleting instance group configuration failed with error: I0513 10:07:01.462950 2349 delete.go:51] Deleting "test"

error deleting cloud resources for InstanceGroup: error deleting autoscaling launch configuration "": InvalidParameter: 1 validation error(s) found.

• minimum field size of 1, DeleteLaunchConfigurationInput.LaunchConfigurationName.

**6.
I expect IG to be removed.

9. Anything else do we need to know?
https://github.com/kubernetes/kops/blob/release-1.12/upup/pkg/fi/cloudup/awsup/aws_cloud.go#L367

Here is checks for LauchConfiguration but if you're using ASG with LauchTemplate it does not reference launch config and as the fact it returns empty string.

[pkutishch]

#6951 - Fix in this PR

[pkutishch]

PR merged.