if normalize-vector takes zero vector, return zero vector instead of nan vector #277
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current EusLisp implemnetatoin returns
#f(nan nan nan)
for#f(0 0 0)
input.However if yo uuse jskeus, it returns
#f(0 0 0)
for#f(0 0 0)
input.https://github.com/euslisp/jskeus/blob/master/irteus/irtmath.l#L610-L620
So this will not affect normal jskeus users, and will make #264 much simpler
how do you think? @mmurooka, @YoheiKakiuchi