correction upgrade de la base

posttemplate/90-one-db

@@ -11,6 +11,8 @@ script="$1"
 function clean_backups()
 {
     file=${1}
+    ls ${file}_* > /dev/null 2>&1
+    if [ $? = 0 ]; then
         bcks=($(ls ${file}_*))
         nbbck=$(expr ${#bcks[@]} - 2)
 
@@ -23,6 +25,7 @@ function clean_backups()
                 rm -f ${bcks[${idx}]}
             done
         fi
+    fi
 }
 
 function updateDB()