Prevent division by 0 error in resource-gatherer

test/e2e/framework/resource_usage_gatherer.go

@@ -205,6 +205,9 @@ func getKubemarkMasterComponentsResourceUsage() ResourceUsagePerContainer {
 }
 
 func (g *containerResourceGatherer) getKubeSystemContainersResourceUsage(c *client.Client) {
+	if len(g.workers) == 0 {
+		return
+	}
 	delayPeriod := resourceDataGatheringPeriod / time.Duration(len(g.workers))
 	delay := time.Duration(0)
 	for i := range g.workers {