add nil check in if statement configmap example, also note why
add nil check in if statement configmap example, also note why

fibonacci1729/helm,technosophos/deployment-manager,jascott1/helm,technosophos/k8s-helm,jascott1/helm,technosophos/deployment-manager,technosophos/deployment-manager,SlickNik/helm,technosophos/deployment-manager,appscode/helm,technosophos/deployment-manager,appscode/helm,SlickNik/helm,technosophos/k8s-helm,fibonacci1729/helm