Ignore empty snapshots

listener.go

diff --git a/listener.go b/listener.go
index fbf901f..3cb3b4e 100644
--- a/listener.go
+++ b/listener.go
@@ -39,6 +39,9 @@
 		switch table.Name {
 		case MANIFEST_TABLE:
 			log.Debugf("Snapshot of %s with %d rows", table.Name, len(table.Rows))
+			if len(table.Rows) == 0 {
+				return
+			}
 			// todo: should be 0 or 1 per system!!
 			row := table.Rows[len(table.Rows)-1]
 			err = processNewManifest(row)