Merge pull request #11278 from olemarkus/automated-cherry-pick-of-#11…

…276-origin-release-1.20

Automated cherry pick of #11276: If one tries to use eip with a public ip that doesn't exist,

upup/pkg/fi/cloudup/awstasks/elastic_ip.go

@@ -135,7 +135,7 @@ func (e *ElasticIP) find(cloud awsup.AWSCloud) (*ElasticIP, error) {
 		}
 
 		if response == nil || len(response.Addresses) == 0 {
-			return nil, nil
+			return nil, fmt.Errorf("found no ElasticIPs for: %v", e)
 		}
 
 		if len(response.Addresses) != 1 {