fix: ensure all report subcommands exit 0 when there is no app

Closes #7454

plugins/cron/subcommands.go

@@ -2,6 +2,7 @@ package cron
 
 import (
 	"encoding/json"
+	"errors"
 	"fmt"
 	"os"
 
@@ -55,6 +56,10 @@ func CommandReport(appName string, format string, infoFlag string) error {
 	if len(appName) == 0 {
 		apps, err := common.DokkuApps()
 		if err != nil {
+			if errors.Is(err, common.NoAppsExist) {
+				common.LogWarn(err.Error())
+				return nil
+			}
 			return err
 		}
 		for _, appName := range apps {