fix(swarm/services): avoid sending credSpec object when empty EE-6178 (#10441)

app/docker/views/services/edit/serviceController.js

@@ -475,7 +475,7 @@ angular.module('portainer.docker').controller('ServiceController', [
         '';
       if (oldCredSpecId && !credSpecId) {
         delete config.TaskTemplate.ContainerSpec.Privileges.CredentialSpec;
-      } else if (oldCredSpecId !== credSpec) {
+      } else if (credSpec && oldCredSpecId !== credSpec) {
         config.TaskTemplate.ContainerSpec.Privileges = {
           ...(config.TaskTemplate.ContainerSpec.Privileges || {}),
           CredentialSpec: {
@@ -855,6 +855,10 @@ angular.module('portainer.docker').controller('ServiceController', [
 
     $scope.filterConfigs = filterConfigs;
     function filterConfigs(configs) {
+      if (!configs) {
+        return [];
+      }
+
       return configs.filter((config) => $scope.service.ServiceConfigs.every((serviceConfig) => config.Id !== serviceConfig.Id));
     }