Fix fill(linear) when multiple series exist and there are null values #8149
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When there were multiple series and anything other than the last series
had any null values, the series would start using the first point from
the next series to interpolate points.
Interpolation should not cross between series. Now, the linear fill
checks to make sure the next point is within the same series before
using it to perform interpolation.
Fixes #8148.