Feat: [#3171] normalize zero vector

[Autsider666]

===:clipboard: PR Checklist :clipboard:===

• [x] :pushpin: issue exists in github for these changes
• [x] :microscope: existing tests still pass
• [x] :see_no_evil: code conforms to the style guide
• [x] :triangular_ruler: new tests written and passing / old tests updated with new scenario(s)
• [x] :page_facing_up: changelog entry added (or not needed)

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Closes #3171

Changes:

• Vector.normalize() return zero-vector ((0,0)) instead of (0,1) when normalizing a vector with a magnitude of 0