correction upgrade de la base

posttemplate/90-one-db

@@ -11,17 +11,20 @@ script="$1"
 function clean_backups()
 {
     file=${1}
-    bcks=($(ls ${file}_*))
-    nbbck=$(expr ${#bcks[@]} - 2)
+    ls ${file}_* > /dev/null 2>&1
+    if [ $? = 0 ]; then
+        bcks=($(ls ${file}_*))
+        nbbck=$(expr ${#bcks[@]} - 2)
 
 
-    if [[ ${nbbck} -gt 1 ]]
-    then
-        EchoGras "Cleaning up old backups !"
-        for idx in `seq 0 ${nbbck}`
-        do
-            rm -f ${bcks[${idx}]}
-        done
+        if [[ ${nbbck} -gt 1 ]]
+        then
+            EchoGras "Cleaning up old backups !"
+            for idx in `seq 0 ${nbbck}`
+            do
+                rm -f ${bcks[${idx}]}
+            done
+        fi
     fi
 }