movingAverage shows no data under ceres file format if time window is "empty" at the start

[rbuckland]

We have switched over to using Ceres on out main stats engine.
All is well, (170G down to 1.4G) so happy days.

when we went back over some of the saved Graphs that show data in a movingAverage, we noticed that with Ceres (v0.10.0) the data does not show (No Data) if the time window selected starts "before" the data was created.. (for example.)

Out data started coming in at 12:12AM.. and we set a movingAverage(...,2)

When we put the time window starting at 12:12, No Data
change it to 12:13, and the graph appears

I am logging this here under ceres because it seems to be related..
any thoughts as to the cause ? I am happy to triage this more .. (i.e. has movingAverage changed (or not had a 0.9.12+ patch applied ? )

[iain-buclaw-sociomantic]

I can't reproduce this, but then again I am running with #32 applied, which affects data returned to graphite. There was a change in graphite-web which also would help too (graphite-project/graphite-web#1529)