no data after change graph template

[liung]

Here I use another way to realize it .

I create a new graph with 95th percentile template , then I rename the old rrd file to the new rrd file , then it works . After doing this , I delete the old graphs and data source.

I use this way because when I associate the preserved data sources , I found the new graph's data sources is still there , this will double the rrd file and the query .