Minor doc/code fixes

docs/reference/cluster_manifest.md

@@ -123,7 +123,7 @@ These parameters are grouped directly under  the `spec` key in the manifest.
   Determines if the logical backup of this cluster should be taken and uploaded to S3. Default: false.
 
 * **logicalBackupSchedule**
-  Backup schedule in the Cron format. Please take [the reference schedule format](https://kubernetes.io/docs/tasks/job/automated-tasks-with-cron-jobs/#schedule) into account. Default: "30 00 \* \* \*"
+  Schedule for the logical backup k8s cron job. Please take [the reference schedule format](https://kubernetes.io/docs/tasks/job/automated-tasks-with-cron-jobs/#schedule) into account. Default: "30 00 \* \* \*"
 
 ## Postgres parameters
 

docs/reference/operator_parameters.md

@@ -482,7 +482,7 @@ scalyr sidecar. In the CRD-based configuration they are grouped under the
     Determines if the operator creates a Kubernets Cron job to do a logical backup of all Postgres clusters it controls. Default: false.
   
   * **logical_backup_schedule**
-    Backup schedule in the cron format. Default: "30 00 \* \* \*"
+    Backup schedule in the cron format. Please take [the reference schedule format](https://kubernetes.io/docs/tasks/job/automated-tasks-with-cron-jobs/#schedule) into account. Default: "30 00 \* \* \*"
   
   * **logical_backup_docker_image**
     Docker image for the pods of the cron job. Must implement backup/uploading logic. Default: empty.

pkg/cluster/k8sres.go

@@ -1257,14 +1257,18 @@ func (c *Cluster) getClusterServiceConnectionParameters(clusterName string) (hos
 func (c *Cluster) generateLogicalBackupJob() (*batchv1beta1.CronJob, error) {
 
 	var (
-		err         error
+		err                  error
-		podTemplate *v1.PodTemplateSpec
+		podTemplate          *v1.PodTemplateSpec
+		resourceRequirements *v1.ResourceRequirements
 	)
 
 	c.logger.Debug("Generating logical backup pod template")
 
 	defaultResources := c.makeDefaultResources()
-	resourceRequirements, err := generateResourceRequirements(c.Spec.Resources, defaultResources)
+	resourceRequirements, err = generateResourceRequirements(c.Spec.Resources, defaultResources)
+	if err != nil {
+		return nil, fmt.Errorf("could not generate resource requirements for the pod of a logical backup cron job: %v", err)
+	}
 
 	envVars := c.generateLogicalBackupPodEnvVars()
 	logicalBackupContainer := generateSpiloContainer(