Modify output of some math operators for empty inputs #9337
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As described in #9335, these math operators are changed to output an empty list when the input list is empty:
sum[]
- currently returns 0product[]
- currently returns 1maxall[]
- currently returns -Infinityminall[]
- currently returns Infinityaverage[]
- currently returns NaNvariance[]
- currently returns NaNstandard-deviation[]
- currently returns NaNDue to a minor break with backward compatibility, this should be targeted for v5.4