Don't call fillNullsWithZero() before graphing.
Don't call fillNullsWithZero() before graphing.

I can't remember why that was needed.  If I remember, I'll put it back, but
meanwhile, various charts actually do different things with 0 vs null (ie.
you don't get a line for values that are null).

apenwarr/afterquery,apenwarr/afterquery,apenwarr/afterquery,apenwarr/afterquery,apenwarr/afterquery