Fix panic in spidercoordinator informer #3269
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What type of PR is this?
What this PR does / why we need it:
Fix panic in spidercoordinator informer: if the serviceCIDR resource can't be list, the serviceCIDRLister should be nil, in the case, we update the service cidr of the spidercoordinator.status from k8s service cidr.
Which issue(s) this PR fixes:
Fixes #3263
Special notes for your reviewer: