empty ProviderID block RunOnce

[daimaxiaxie]

Which component are you using?:

Cluster Autoscaler

What version of the component are you using?:

Component version: 1.28.0

What k8s version are you using (kubectl version)?:

kubectl version Output

$ kubectl version
Client Version: version.Info{Major:"1", Minor:"19", GitVersion:"v1.19.16", GitCommit:"e37e4ab4cc8dcda84f1344dda47a97bb1927d074", GitTreeState:"clean", BuildDate:"2021-10-27T16:25:59Z", GoVersion:"go1.15.15", Compiler:"gc", Platform:"linux/amd64"}
Server Version: version.Info{Major:"1", Minor:"19+", GitVersion:"v1.19.3-5", GitCommit:"dcc97265743078854c5328e30727147bdc5d1c37", GitTreeState:"clean", BuildDate:"2020-12-04T03:52:29Z", GoVersion:"go1.15.5", Compiler:"gc", Platform:"linux/amd64"}

What environment is this in?:

ali, ali cloud provider

What did you expect to happen?:

When there is an empty ProviderID node in the cluster, the Cluster Autoscaler is not affected.

What happened instead?:

Empty ProviderID node blocks RunOnce, it can't scale up and down.

Log:

I0122 18:14:46.304776       1 static_autoscaler.go:287] Starting main loop
I0122 18:14:46.305345       1 mixed_nodeinfos_processor.go:81] GetNodeInfosForGroups: nodes **
I0122 18:14:46.305358       1 mixed_nodeinfos_processor.go:216] Scheduled pods ***
I0122 18:14:46.305389       1 mixed_nodeinfos_processor.go:122] GetNodeInfosForGroups: starting to process ready node
E0122 18:14:46.305610       1 alicloud_cloud_provider.go:135] failed to get instance Id from provider Id:,because of AliCloud: unexpected ProviderID format, providerID=
E0122 18:14:46.305620       1 static_autoscaler.go:359] Failed to get node infos for groups: AliCloud: unexpected ProviderID format, providerID=
I0122 18:15:01.305715       1 static_autoscaler.go:287] Starting main loop

How to reproduce it (as minimally and precisely as possible):

In the ali cloud environment, add an empty ProviderID node to the cluster.

Anything else we need to know?:

NodeGroupForNode in ali cloud provider will return err, make MixedTemplateNodeInfoProvider.Process return an error early, main loop ends.

[Shubham82]

/area cluster-autoscaler