fixed swallowed errors under pkg subdirectory.

pkg/instancegroups/instancegroups.go

@@ -103,6 +103,9 @@ type DeleteInstanceGroup struct {
 
 func (c *DeleteInstanceGroup) DeleteInstanceGroup(group *api.InstanceGroup) error {
 	groups, err := FindCloudInstanceGroups(c.Cloud, c.Cluster, []*api.InstanceGroup{group}, false, nil)
+	if err != nil {
+		return fmt.Errorf("error finding CloudInstanceGroups: %v", err)
+	}
 	cig := groups[group.ObjectMeta.Name]
 	if cig == nil {
 		glog.Warningf("AutoScalingGroup %q not found in cloud - skipping delete", group.ObjectMeta.Name)

pkg/resources/aws.go

@@ -891,7 +891,9 @@ func ListSubnets(cloud fi.Cloud, clusterName string) ([]*ResourceTracker, error)
 
 		rtRequest := &ec2.DescribeRouteTablesInput{}
 		rtResponse, err := c.EC2().DescribeRouteTables(rtRequest)
-
+		if err != nil {
+			return nil, fmt.Errorf("error describing RouteTables: %v", err)
+		}
 		// sharedNgwIds is the set of IDs for shared NGWs, that we should not delete
 		sharedNgwIds := sets.NewString()
 		{