Merge pull request #1943 from clarkchentw/patch-1

Fix possible error occur for v-rebuild-cron-jobs

func/main.sh

@@ -610,7 +610,7 @@ sync_cron_jobs() {
     else
         crontab="/var/spool/cron/$user"
     fi
-    rm -f $crontab
+    >$crontab
     if [ "$CRON_REPORTS" = 'yes' ]; then
         echo "MAILTO=$CONTACT" > $crontab
         echo 'CONTENT_TYPE="text/plain; charset=utf-8"' >> $crontab
@@ -1304,4 +1304,4 @@ no_symlink_chmod() {
 
         chmod "${filemode}" "${i}"
     done
-}
+}