FIX: DivisionByZero error in normalization #329
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This PR fixes the audio normalization util functions.
There was a bug where trying to normalize a series of 0. with a PEAK normalization or computing the z-score of a constant series (with std=0) would try to divide all values by zero.
With the changes from this PR, the divider is computed first, then the division is done only if the divider is not 0.