fix: Allow zero reach in relative frequency variance computation.

[ple13]

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[SanjayVas]

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[stevenwarejones]

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src/main/kotlin/org/wfanet/measurement/measurementconsumer/stats/Variances.kt line 164 at r3 (raw file):

      relativeFrequencyMeasurementVarianceParams

    require(totalReach >= 0) { "Total reach must be non-negarive, but got $totalReach." }

non-negative

[kungfucraig]

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[ple13]

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src/main/kotlin/org/wfanet/measurement/measurementconsumer/stats/Variances.kt line 164 at r3 (raw file):

Previously, stevenwarejones (Steven Ware Jones) wrote…

non-negative

Done.

[ple13]

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