[release-1.23] fix: panic when controller does not have cloud config

[k8s-infra-cherrypick-robot]

This is an automated cherry-pick of #1250

/assign andyzhangx

fix: panic when controller does not have cloud config

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[andyzhangx]

/cherrypick release-1.22

[k8s-infra-cherrypick-robot]

@andyzhangx: #1251 failed to apply on top of branch "release-1.22":

Applying: fix: panic when controller does not have cloud config
Using index info to reconstruct a base tree...
M	pkg/blob/azure.go
M	pkg/blob/azure_test.go
M	pkg/blob/controllerserver.go
M	pkg/blob/nodeserver.go
Falling back to patching base and 3-way merge...
Auto-merging pkg/blob/nodeserver.go
Auto-merging pkg/blob/controllerserver.go
Auto-merging pkg/blob/azure_test.go
CONFLICT (content): Merge conflict in pkg/blob/azure_test.go
Auto-merging pkg/blob/azure.go
CONFLICT (content): Merge conflict in pkg/blob/azure.go
error: Failed to merge in the changes.
hint: Use 'git am --show-current-patch=diff' to see the failed patch
Patch failed at 0001 fix: panic when controller does not have cloud config
When you have resolved this problem, run "git am --continue".
If you prefer to skip this patch, run "git am --skip" instead.
To restore the original branch and stop patching, run "git am --abort".

In response to this:

/cherrypick release-1.22

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