GEOPY-2608: Ignore segments of zero length to prevent warning from numpy

[benk-mira]

GEOPY-2608 - Ignore segments of zero length to prevent warning from numpy

[Copilot]

Pull request overview

Adds explicit handling and test coverage for zero-length segments when computing segment orientations, preventing divide-by-zero warnings and clarifying expected behavior in downstream drivers that consume segment azimuth.

Changes:

• Update orientation_from_segments to return NaN orientations for zero-length segments instead of dividing by zero.
• Add a unit test validating lengths/orientations across typical, mirrored, and zero-length segment cases.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
curve_apps/utils.py	Avoids division by zero in orientation_from_segments by masking zero-length segments and returning NaN orientations for them.
tests/utils_test.py	Adds coverage for orientation_from_segments, including a zero-length segment case asserting NaN orientation.

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