fix: return NaN from median on empty collections - #254
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Empty collections took the even-length path and indexed an empty sorted list (IndexError). Return NaN like mean_by on empty input.
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coverage: 100.0%. remained the same — santhreal:fix/median-empty-nan into dgilland:develop |
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pydash.numerical.median hits IndexError when median([]). This PR fixes the regression with a focused test covering the case.