EE-1110 Ingress routes and their mapping to a application name are not deleted when the application is deleted (#5291)

Co-authored-by: Simon Meng <simon.meng@portainer.io>

app/kubernetes/helpers/application/index.js

@@ -282,7 +282,7 @@ class KubernetesApplicationHelper {
         res.IngressName = rule.IngressName;
         res.IngressRoute = rule.Path;
         res.IngressHost = rule.Host;
-        res.IngressHosts = ingress.find((i) => i.Name === rule.IngressName).Hosts;
+        res.IngressHosts = ingress && ingress.find((i) => i.Name === rule.IngressName).Hosts;
       }
       res.Protocol = port.Protocol;
       res.ContainerPort = port.TargetPort;