Silent error if there is no timestamp.

It's not a bug, it's a feature.

slapos-node/slapos-start

@@ -73,8 +73,9 @@ if [ $ONLY_SLAPFORMAT = false ]; then
     echo "done."
 
     # Delete timestamp of all partitions so that it will force slapgrid to process them.
-    rm /srv/slapgrid/slappart*/.timestamp
+    rm /srv/slapgrid/slappart*/.timestamp 2>/dev/null
 
     # Run slapgrid now.
     /opt/slapos/bin/slapgrid-cp --verbose --now --logfile=/opt/slapos/slapgrid-cp.log --pidfile=/opt/slapos/slapgrid-cp.pid $SLAPOS_CONFIGURATION/slapos.cfg >> /opt/slapos/slapgrid-cp.log 2>&1
 fi
+